Seikatsu Shuukan The Animation

Synopsis

In "Seikatsu Shuukan The Animation," Shuntarou is a typical high school student with an unhealthy obsession for adult material, especially fixating on his younger sisters in an improper manner. He steals their underwear to gratify his urges, causing them to strongly dislike him. What he truly craves is a kind, nurturing older sister, unlike the ones he has. After a certain event, he finds a strange video game labeled "Older Sister Week-Long Experience" on his computer, although he never installed it. Even though the game appears not to launch, Shuntarou wakes up the next day transformed into an eleven-year-old version of himself. When his sisters encounter him, he claims to be Koharu, a friend of Shuntarou's from online. Charmed by his endearing behavior, they give him lots of affection, letting Koharu enjoy the caring attention from his unknowing, now older sisters.