Tonikaku Kawaii

Nasa Yuzaki survives a truck accident and agrees to marry Tsukasa Tsukuyomi after she saves him.

Bleeding on a snowy street, Nasa Yuzaki reflects on his life, recalling ridicule for his name and his dedication to studying for an elite school. Just before his entrance exam, he is struck by a truck while attempting to speak to Tsukasa Tsukuyomi. Tsukasa intervenes, saving his life. Upon waking, Nasa pursues her to express gratitude, and she agrees to date him on the condition that they marry once they are of legal age. After being discharged from the hospital, Nasa takes the entrance exam the following year but chooses to work instead of attending high school, hoping to reunite with Tsukasa. Shortly after turning 18, Tsukasa arrives at his apartment to complete the marriage registration and submit it to the bureau, officially making their marriage legal.

Nasa and Tsukasa buy a futon after struggling to share a single bed at Nasa's apartment.

Upon returning to Nasa's apartment, Nasa struggles to determine sleeping arrangements for Tsukasa because the single bed is too small for two people. The pair goes shopping and purchases a futon specifically for Tsukasa. That night, Tsukasa experiences difficulty sleeping and rolls over, which causes her to get up and drink water. When she returns to the room, she accidentally pulls Nasa's comforter off his bed, leaving him exposed to the cold for the remainder of the night. The following morning, Tsukasa wakes up and prepares breakfast while instructing Nasa to stop being so formal with her.

Tsukasa and Nasa visit a bathhouse where Nasa meets Kaname and Tsukasa reunites with Aya.

After breakfast, Tsukasa and Nasa go to a bathhouse because their apartment has no bathtub. Nasa introduces Tsukasa to Kaname Arisugawa, who runs the facility with her sister Aya. Kaname questions Nasa about his relationship and demands he make Tsukasa happy. In the women's section, Tsukasa meets Aya, who offers to scrub her back. Tsukasa learns Aya was her middle school classmate. Later, they pass a chapel with a wedding in progress. Nasa leaves to run an errand and asks Tsukasa to return home. On the way back, a girl in a limo watches Tsukasa and calls her sister.

Chitose kidnaps Nasa to break up his marriage to Tsukasa using maids and scandalous photos.

Tsukasa returns home, where her foster sister Chitose Kaginoji confronts her upon learning of the marriage. Chitose subsequently kidnaps Nasa and transports him to her family mansion, plotting to dismantle the union through tabloid journalism orchestrated by maids Charlotte and Aurora. During the ensuing chaos, Nasa attempts to hide but is discovered by Charlotte. In the struggle, Charlotte accidentally damages the nitrogen casing containing Tsukasa’s moon rock, which Nasa temporarily repairs. Chitose accuses Nasa of ignorance regarding Tsukasa’s dreams, asserting her own role in fulfilling them. Although Aurora produces a scandalous photograph, Tsukasa arrives to seize it. The couple then flees the mansion via a secret passage, sharing their first kiss.

Nasa and Tsukasa navigate the complexities of purchasing an affordable diamond ring for their engagement.

Nasa and Tsukasa visit an electronics store to shop for a TV. Later at the bathhouse, Nasa tells Kaname about his verbal commitment to Tsukasa, after which she tells him that it is important for him to buy an engagement ring. After leaving the bathhouse, the two stop by at a nearby park and kiss while Charlotte and Aurora secretly observe them. That night, Nasa learns the difference between engagement and wedding rings. Afterwards, Nasa insists that he has to buy a diamond ring. The next day, the two go shopping in Omotesando, and Nasa is shocked at the price tag for a Honey Winston diamond ring, but is talked into buying one until Tsukasa drags him out of the store. Tsukasa tells Nasa that she does not want him to spend his savings on a ring. Instead, the two stop by at a jeweler in Okachimachi with affordable diamond rings but the price is still too much to get Nasa to understand. Eventually, they end up buying a pair of cheap diamond rings and Tsukasa expresses her appreciation on their way home.

Nasa proposes moving to a larger apartment and plans a honeymoon trip to Kyoto with Tsukasa.

After Tsukasa enters Nasa’s bed following a water break, Nasa considers relocating to a larger residence the next day, even though Tsukasa is content with their current living situation. He later presents the advantages of moving to Tsukasa but recognizes the necessity of parental guarantors. Since he has not yet disclosed their marriage to his family, Nasa contacts his parents to share the news. The following day, he speaks with his mother and invites her to visit them in Nara. Tsukasa suggests extending the visit into a honeymoon that includes a stop in Kyoto. She purchases a camera, and that evening, the couple departs on a bus for their journey while Chitose and her maids secretly follow them.

Chitose attempts to separate Tsukasa and Nasa during a bus trip to Kyoto.

During a bus stop at a service area, Chitose and her maids seek to end Tsukasa's relationship with Nasa. Tsukasa tries lime udon but finds it disappointing. When TV cameramen arrive, the couple quickly returns to the bus to avoid public attention. The next morning, the bus reaches Kyoto. Chitose separates the pair by sending Tsukasa to a manga museum, leaving Nasa on a date with her to prove his worthiness as a husband. Although Nasa lacks knowledge about Tsukasa, he convinces Chitose by discussing a past accident and mathematical principles. Chitose and her maids return to Tokyo, but Nasa remains unconvinced that she has abandoned her plans to sabotage their relationship.

Tsukasa and Nasa visit Nara to meet Nasa's parents and discover their apartment burned down in Tokyo.

Tsukasa and Nasa travel to Nara to visit Nasa's parents, Kanoka and Enishi, who relocated there for his father's archaeological work. While Nasa bathes, Tsukasa speaks privately with Enishi. The following morning, she visits Enishi's book-filled office and discusses her interest in history before they sightsee in Nara. They visit the former Heijō Palace site to record a video for Enishi, who watched over Nasa during their earlier conversation. After leaving Nara that night, the pair returns to Tokyo the next morning. Upon arrival, they discover that their apartment has been destroyed by fire.

Nasa and Tsukasa visit a bathhouse and laundromat while Aya remains unaware of their marriage.

Nasa and Tsukasa plan to visit a bathhouse, prompting Kaname to suggest they reside there temporarily until they secure alternative housing. Kaname later reflects on how Aya, who harbors feelings for Nasa, will respond to the news. It is disclosed that Aya remains ignorant of Nasa's marriage until her mother mentions it. Several days pass before the couple visits a laundromat. Following this, they travel to Harajuku to purchase new clothing for Tsukasa, as she lost many of her previous garments in a fire. The narrative focuses on their daily routine adjustments and the social dynamics surrounding their living situation and relationships.

Tsukasa and Nasa explore new housing options and share romantic moments at Otogi Park.

Tsukasa and Nasa adjust to their temporary residence, with Nasa praising Tsukasa’s cooking during dinner. The following day, Nasa’s previous landlord proposes a unit in a new complex built on the site of his former burning apartment, offering the same rent. The couple inspects a model apartment but accidentally enters a luxury high-rise unit instead. Following this visit, Tsukasa tells Nasa that home is wherever they are together. Later, Tsukasa assists with chores at the bathhouse, prompting Kaname to thank her for saving Nasa. That evening, the pair goes grocery shopping and detours to Otogi Park for a romantic moment.

Tsukasa hosts a takoyaki party and video game tournament with friends.

Chitose and her maids discover that Nasa and Tsukasa’s apartment burned down. When Chitose asks Tsukasa for her current residence, Tsukasa lies to avoid her. Upon arriving at the bathhouse, Tsukasa finds Nasa staring at a takoyaki plate. After learning what it is, Nasa decides to host a takoyaki party. Chitose arrives and attempts to bribe Tsukasa by promising to buy several video game consoles, an offer overheard by Aya. Aya questions Tsukasa’s cooking abilities, but after enjoying the meal, everyone plays Street Fighter V. Tsukasa, Aya, and Chitose agree to a tournament where the winner can command Nasa to do anything. Aya wins the match, leading Tsukasa to challenge her to the original Street Fighter. This shared experience helps them form a bond. After the party concludes, Tsukasa kisses Nasa, revealing the prize she intended to claim had she won.

Nasa catches a cold after overworking, leading to a summer festival outing with Tsukasa and friends

Nasa pushes himself too hard at work and falls ill with a cold. Tsukasa insists he rest, citing his duty as her husband. Later, the couple dresses in yukatas and visits a summer festival. They enjoy takoyaki before encountering Aya and Chitose at a goldfish scooping game. The group then visits a shrine to pray. The evening ends with Tsukasa and Nasa watching fireworks alongside Kaname, Aya, Chitose, and her maids.

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