

Seto no Hanayome
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Episodes (26)
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EP 1Teenager Nagasumi Michishio marries mermaid Sun Seto after being rescued from drowning
Apr 2, 2007While drowning in the ocean near Seto Island, teenage boy Nagasumi Michishio is rescued by the chivalrous mermaid Sun Seto. Strict regulations within mermaid society dictate that both individuals must enter into a marriage to ensure their continued survival. Unaware of the true nature of Sun's clan, Nagasumi finds himself bound to a group that operates as a yakuza organization. This unexpected union forces the young man to navigate the dangerous and complex world of the underworld, hidden beneath the guise of a traditional mermaid family structure, as he adjusts to his new life and the severe consequences of breaking their ancient laws.
EP 2Nagasumi protects Sun's tail during their Bon festival date
Apr 9, 2007Nagasumi enjoys his first date with Sun at the Bon festival, where most stalls are operated by the Seto Gang. During the event, Nagasumi discovers that Sun's legs revert into a tail when she is splashed with water. To prevent this transformation from being exposed, he must actively protect her by desiccating her legs. This situation requires Nagasumi to manage the risk of her secret being revealed while navigating the crowded festival environment dominated by the Seto Gang members.
EP 3Nagasumi and Sun face an assassination trap on a deserted island.
Apr 16, 2007Nagasumi and Sun spend a day alone on a deserted island, unaware that the situation is a trap designed to eliminate Nagasumi. Maki, known as "the Conch," is revealed to be a notorious assassin from the Seto Group and a longtime friend of Sun. Maki is actively pursuing Nagasumi's life, turning their isolated time together into a deadly confrontation. The episode centers on this betrayal and the immediate threat posed by Sun's former associate, highlighting the danger lurking beneath their seemingly peaceful excursion.
EP 4Sun and Maki move into Nagasumi's city home while he retreats to the attic.
Apr 23, 2007Sun and Maki accompany Nagasumi to his residence in the city, where they are set to live with his parents. Consequently, Nagasumi is compelled to vacate his bedroom and reside in the attic instead. During this transition, Nagasumi and Sun encounter Mawari Zenigata, the leader of the Disciplinary Committee, who is revealed to be a childhood friend of Nagasumi. This meeting introduces a new dynamic to their living arrangement and social circle within the household.
EP 5Sun and Nagasumi face a school staffed by Sun's family and gang posing as teachers.
Apr 30, 2007Sun and Nagasumi begin their first day of school, unaware that the faculty consists of Sun's parents, Gōzaburō and Ren Seto, alongside the Seto Gang, all disguised as educators. Complications arise when Nagasumi's friend, Hideyoshi "Chimp" Sarutobi, develops romantic feelings for Sun. Consequently, Nagasumi is forced to endure a barrage of hostile actions from his new classmates, who are actually his father's associates. The narrative focuses on Nagasumi's struggle to navigate this dangerous environment while trying to survive the constant attacks orchestrated by the disguised Seto Gang members who are posing as teachers at their middle school.
EP 6Mawari Suspects Sun Is a Fish After Water Spill Incident
May 7, 2007Following an accidental water spill on Sun by the Class Rep, Mawari observes Sun's tail and deduces that Sun is a fish. She proceeds to attempt splashing Sun repeatedly to confirm this hypothesis. Nagasumi intervenes to protect Sun from these actions. Simultaneously, he struggles to save Mawari's life due to the mermaid code of law. The situation escalates as Nagasumi balances defending Sun while navigating the legal constraints imposed by the mermaid society that threaten Mawari. This sequence highlights the conflict between Mawari's persistent theory and the protective measures taken by Nagasumi amidst the supernatural rules governing their interactions.
EP 7Nagasumi encounters Lunar Edomae, who reveals her mermaid form and seeks to enslave him.
May 14, 2007Nagasumi unexpectedly meets celebrity pop idol Lunar Edomae, who accidentally exposes her true mermaid nature to him. In response, Lunar decides to make Nagasumi her eternal slave. He later discovers that she is a childhood friend and rival of Sun. Lunar devises a plan to defeat Sun once and for all. This conflict divides the middle school into opposing factions based on the popularity contest between Sun and Lunar. The narrative focuses on the interpersonal dynamics and the resulting social split within the school environment as these rivalries play out.
EP 8Nagasumi proposes a singing contest to resolve the escalating school conflict involving Maki.
May 21, 2007Tensions at the school continue to rise, resulting in Maki being injured during the escalating disputes. To prevent the situation from devolving into a total war, Nagasumi devises a plan to settle all differences through a singing competition pitting the Sun group against the Lunar group. As part of this scheme to ensure peace and resolve the ongoing conflicts, Nagasumi places himself as the collateral, risking his own well-being to facilitate the resolution between the two factions and stop the violence that has already caused harm to others.
EP 9Kai Mikawa, an agoraphobic merman, challenges Nagasumi for Sun's hand in marriage.
May 28, 2007The arrival of Kai Mikawa, a handsome and wealthy merman suffering from agoraphobia, intensifies the chaos in Nagasumi's life. Mikawa claims that Sun is his deep fiancée and subsequently enrolls in their school. Tensions escalate as he directly confronts Nagasumi, issuing a challenge for Sun's hand in marriage during the upcoming sports festival. This rivalry forces Nagasumi to deal with the persistent interference of his rival, who insists on his engagement to Sun despite the objections of those around him. The situation becomes increasingly frantic as the sports festival approaches, marking a significant escalation in the conflict between the two suitors.
EP 10A powerful man stalks Nagasumi while Sun intervenes and Gouzaburou fights Lunar's Papa.
Jun 4, 2007A man known for his immense strength and overwhelming endurance, later identified as Lunar's Papa, relentlessly pursues Nagasumi with no obstacles stopping him. Although Nagasumi attempts to warn his friends, they initially refuse to believe his claims. The situation escalates when Nagasumi encounters Mikawa, prompting both of them to flee for their lives. Sun eventually locates Nagasumi and attempts to shield him from the attacker. This leads to a direct hand-to-hand combat confrontation between Gouzaburou and Lunar's Papa. The narrative serves as a slight parody of the films Terminator 2: Judgment Day and Total Recall.
EP 11Gouzaburou's Gift Causes Accidental Giant Transformation
Jun 11, 2007Following a diet by Sun and Lunar, Gouzaburou purchases various gifts to support them, including a special mineral mermaid water designed to provide energy and strength. However, complications occur when Nagasumi accidentally consumes the beverage. This mistake grants him the abilities of a merman while simultaneously causing his body to expand to gigantic proportions. The situation creates numerous difficulties for those involved. To resolve the crisis, everyone collaborates and contributes their efforts to reverse the transformation process and restore normalcy.
EP 12Lunar seeks tutoring from Nagasumi but accidentally transforms into a mermaid during the session.
Jun 18, 2007With their mother away, Lunar asks Nagasumi to tutor her because she is failing all her classes. Maki observes them and assumes they are flirting, though both deny any romantic feelings. While drying Lunar after she accidentally spills water on herself, she transforms into a mermaid. Nagasumi’s father arrives just as Nagasumi is finishing the process, creating a misunderstanding. Lunar then confesses her new feelings for him, which saves Nagasumi from trouble and results in them becoming engaged.
EP 13Nagasumi rejects forced marriage while Sun intervenes to declare her love
Jul 2, 2007Nagasumi is brought to Lunar’s residence for an impending wedding ceremony. Just before he is to become her husband, he expresses disapproval of the false union and refuses to proceed. Sun arrives and voices her opposition to the event, using her sword to defeat Lunar’s guards while announcing her love for Nagasumi. Ultimately, Sun and Lunar collaborate to persuade the alliance between the two yakuza families.
EP 14Nagasumi brings a kitten to school, discovering his friends' severe fear of cats.
Jul 9, 2007Nagasumi introduces a kitten to the school environment, only to realize that Sun, Lunar, and Maki suffer from intense ailurophobia. He initially suspects Gouzaburou shares this phobia, but learns that mermaids typically outgrow such fears as they age. However, Gouzaburou remains afflicted due to a traumatic childhood incident. Recognizing this unique vulnerability, Nagasumi attempts to leverage the situation for his own benefit. The situation escalates uncontrollably when Gouzaburou triggers the fire alarm, forcing the entire student body to evacuate to the school grounds. This chaotic event highlights the severe impact of Gouzaburou's unresolved trauma on the school routine and the other students involved.
EP 15Nagasumi Meets the Class Rep During a Double Date Incident
Jul 16, 2007Nagasumi, Sun, Lunar, Mawari, Chimp, and Mikawa attend a planned double date. While fetching juice for Lunar, Nagasumi collides with the Class Rep at an intersection, though he fails to recognize her. It is revealed that she harbors feelings for him. During the accident, Nagasumi accidentally steps on and breaks her glasses, preventing her from identifying him. Once she acquires new glasses, she recognizes Nagasumi and flees the scene. He pursues her and asks for her name, but she runs away again, promising to reveal it the next time they meet.
EP 16Mermaid examiner Akeno Shiranui tests Sun's ability to handle non-humanoid mermaids.
Jul 23, 2007Akeno Shiranui serves as a mermaid examiner tasked with recording and observing mermaids that struggle to coexist with humans, ultimately sending them back to their origin. Sun faces the challenge of overcoming her personal fears while undergoing this rigorous evaluation. She strives to avoid failure as Akeno closely scrutinizes her every action and reaction during the examination process.
EP 17Mawari confronts Akeno after misinterpreting her influence over defeated delinquents.
Jul 30, 2007After Akeno defeats a group of delinquent lords, they begin following her, leading Mawari to mistakenly believe she is also a delinquent. Believing she must protect society, Mawari resolves to fight Akeno with full force. Simultaneously, the Seto Gang formulates their own scheme targeting Akeno. Although Sun eventually succeeds in convincing Mawari to reconsider her perspective on the situation, the inevitable conflict between the parties has already commenced, setting the stage for an unavoidable confrontation.
EP 18Class field trip to Kyoto leads to bathroom investigation after Maki attacks Akeno
Aug 6, 2007The entire class embarks on an unexpected field trip to Kyoto. Following an incident where Maki attacks Akeno, Sun offers an apology. However, Akeno expresses interest in Sun's mermaid body and requests permission to investigate them in the bathroom. Unaware of the true context, Nagasumi and Mawari mishear the conversation and decide to conduct their own investigation into the matter.
EP 19Akeno's Failed Plan to Separate Nagasumi and Sun with a Mermaid Beverage
Aug 13, 2007Following the failure of efforts to drive a wedge between Nagasumi and Sun, Akeno devises a scheme to separate them. She attempts to force Nagasumi to consume a mermaid beverage that supposedly releases a person's strongest desires, thereby compelling Sun to leave him. However, the plan backfires significantly when the beverage is consumed by everyone present except for Nagasumi, rendering the strategy ineffective and failing to achieve the intended separation between the two characters.
EP 20Lunar's Papa uses bishoujo game knowledge to cheer up his daughter, leading to chaotic school cross-dressing.
Aug 20, 2007Lunar's Papa attempts to express his affection and lift his daughter's spirits after discovering a bishoujo game via a search engine. He utilizes this new insight to persuade Gouzaburou regarding the importance of understanding a daughter's emotions, treating the game as a helpful guide. Their efforts quickly spiral out of control as both men engage in cross-dressing activities. This misguided approach results in significant disruption and chaos throughout the school environment, turning their well-intentioned but flawed strategy into a source of widespread trouble for everyone involved.
EP 21Nagasumi receives a love letter and uses a potion that causes widespread romantic and jealous reactions.
Aug 27, 2007Nagasumi, who has never received affection due to his lack of popularity, is overjoyed when the Class Rep gives him a love letter. Maki confiscates the note from his pocket, and Lunar reads it aloud, exposing Nagasumi's desire for popularity. Ren provides him with a potion to address this issue. However, the potion has unintended side effects: all females who see him fall in love with him, while all males who see him develop intense envy. This magical intervention drastically alters social dynamics around Nagasumi, creating chaos rather than the simple popularity boost he sought. The situation escalates as his appearance triggers extreme emotional responses in everyone who witnesses him, complicating his original goal of gaining social acceptance.
EP 22Lunar enlists Sun as a fake lover for a soap opera before practicing ventriloquism with Maki for a competition.
Sep 3, 2007Lunar asks Sun to pretend to be her lover for a soap opera role. Sun takes the part too seriously and eventually stops acting. Later, Lunar decides to enter a parlor trick competition. She practices ventriloquism using Maki as her puppet. Akeno attempts to stop Lunar from participating in the event. Akeno fears that Maki’s true nature might be exposed during the performance. This precautionary measure aims to prevent any potential revelation of Maki’s identity to the public. The episode focuses on these interpersonal dynamics and the preparation for the upcoming contest.
EP 23Akeno questions Masa about her brother while Gouzaburou reveals Masa's true identity to Nagasumi.
Sep 10, 2007Akeno approaches Masa, mistakenly believing he knows her older brother, and inquires about his location. Masa, however, has suffered from memory loss since joining the Seto Gang. Gouzaburou subsequently discloses to Nagasumi that the brother in question is actually Masa himself. Unaware of this revelation, Akeno plans to discipline her sibling for his perceived irresponsibility. Consequently, Nagasumi feels compelled to defend Masa by any means necessary. To resolve the situation, Gouzaburou induces a comatose state in Masa, which ultimately allows him to regain his memories regarding his sister and their shared past.
EP 24Chimp Misunderstands Mikawa's Condition and Friends Plan a Final Celebration
Sep 17, 2007Mikawa suffers from an embarrassing physical blemish on his backside that he wishes to keep secret. While visiting the hospital to collect medication, Chimp overhears a conversation between a doctor and a nurse. He mistakenly interprets their discussion as indicating that Mikawa has an incurable disease. Acting on this false information, Chimp alerts the rest of the group. Believing Mikawa has only a short time left, the friends are heartbroken and determined to make his remaining days as enjoyable as possible. They organize activities to give him the best time of his life during these unforeseen final moments, unaware of the true nature of his medical condition.
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Frequently asked questions
- How many episodes does Seto no Hanayome have?
- Seto no Hanayome has 26 episodes.
- When did Seto no Hanayome come out?
- Seto no Hanayome came out in 2007.
- Which studio made Seto no Hanayome?
- Seto no Hanayome was produced by GONZO.
- Who directed Seto no Hanayome?
- Seto no Hanayome was directed by Seiji Kishi.
- Is Seto no Hanayome finished?
- Current status of Seto no Hanayome: Finished.










