Mitsudomoe Zouryouchuu!

Children are targeted as Japan faces a countdown to doom

Marui House Chaos: Rivalries, Lost Glasses, and Santa Mishaps

Hitoha accidentally ignites a rivalry between Sakiko and the Hopeless Squad while protecting a photo with a Gachitanger. Mitsuba utilizes Futaba as a substitute exercise machine. Yabe attempts to invite Aiko to a Christmas party, but after she loses her glasses, he wraps everyone in red clothing in bandages. Consequently, Yabe spends Christmas alone while Yuki hosts a mixer party that fails to match her King game expectations. When Souijiro returns late, the girls persuade Yabe to act as Santa for Futaba. However, Futaba clings tightly to his clothes, creating a difficult situation when Soujiro arrives home.

Futaba draws erotic manga while Soujiro loses clothes and Yuudai invents a bra unhooking move.

Futaba creates an erotic manga for Yuudai, enlisting Shinya to teach her how to draw underwear on figures. A school fire drill triggers vivid imaginations in Yabe. During a sports event, Soujiro loses his clothing while preparing for a three-legged race with Hitoha, causing an awkward situation. Yuudai develops a technique to unhook girls' bras, resulting in misunderstandings as he searches for someone who actually wears one. Meanwhile, at the Marui house, Mitsuba's friends discover an old photograph of a more handsome Soujiro, prompting Mitsuba to introduce him as her boyfriend.

Futaba’s waterslide mishap and Shinya’s hidden fever at the festival

Futaba creates a handmade waterslide that rips the swimsuits of Mitsuba, Miku, Yuki, and Miyashita, causing embarrassment. Mitsuba nearly drowns from a cramp, and her rescuers are mocked afterward. Miku attempts to scare Mitsuba with fake ghost photos involving Sakiko and Hitoha, but the plan fails. At a festival, Futaba tries to cheer up a depressed Shinya with underwear, only to discover he has a fever and forced himself to attend. Yuudai’s perverted scheme is foiled again. Later, Hitoha’s float bursts at the city pool, leading to a near-drowning incident before Futaba rescues her.

Rumors, Valentine's gifts, and misunderstandings complicate the Hopeless Squad's dynamics.

Shiori Itō writes her crush's name on an eraser, but Airi discovers the secret. During Parent's Day, Marina surveys the class and overhears Miku’s jealousy regarding attention given to unusual peers. On Valentine's Day, Mitsuba’s attempt to make Miku jealous with homemade chocolate fails as Miku’s expensive treats prove superior. For White Day, Mitsuba, Yuki, and Miyashita secretly bake cookies, but their secrecy leads Miku to believe they hate her. Meanwhile, Sakiko mistakenly believes Miku is deceased and becomes attached, reacting poorly when the truth emerges. Later, during physical exams, the boys rank the girls based on silence, a trait they all demonstrate upon receiving their results.

Mitsuba's toilet lock, Soujirou's Valentine's revenge, and Yuudai's snowball prank

Before the New Year, Hitoha and Futaba suffer from bad oranges while Mitsuba uses the toilet, leading Hitoha to trap her in a window. On Valentine's Day, Soujirou seeks revenge on a chocolate recipient and meets Shinya, helping him evade the Hopeless Squad. During a parent-teacher meeting, Shinya's mother Akari worries about stalking, while Yabe hides the truth from Airi, whose brother is a policeman. Later, the class fears Mitsuba throwing snowballs made from snow Yuudai peed on. Finally, on April Fools' Day, an overly cautious Hitoha ignores warnings, hits a post, and is pranked immediately upon waking.

Miku attempts to prove Santa's existence while classmates face various daily classroom challenges.

During Christmas, Miku encourages friends to dress as Santa to convince Ryuuta of his existence. Miyashita observes Hitoha hiding under Yabe’s desk and attempts to use this habit to build a friendship. Meanwhile, substitute teacher Kaieda struggles to manage Futaba, who communicates via written notes due to a lost voice. On a hot day, Mitsuba makes extensive efforts to repair the air conditioner but fails due to her sweat and weight. Later, the class engages in a human curling contest during pool cleanup duties to determine which group must perform the cleaning tasks.

Hitoha hides from Yabe while thwarting a photographer and students plan a relay race strategy

Hitoha fears meeting Gachi Pink at an autograph session but catches a cold. She attends anyway, hiding under Gachi Pink's table to avoid Yabe, where she stops a man taking upskirt photos. Yuudai and Hitoha devise a plan for a relay race against other sixth graders by leveraging each runner's specific traits. A sweet potato salesman known for accurately guessing women's ages is challenged by Hitoha to determine her age. Meanwhile, Soujirou reflects on memories of his daughters when they were younger and behaved better. The episode focuses on these separate interactions involving Hitoha, Yuudai, Soujirou, and various local characters during their daily activities.