不意に現れた、歳の離れた義妹の話

Ryu, a delinquent teenager, is surprised when his rarely present father introduces him to his new stepsister, Suiren, who is twelve years younger. The two begin living together, navigating the challenges of their significant age gap and differing personalities. Ryu takes on responsibilities like cooking and caring for Suiren, despite his rough exterior. Suiren, initially shy, starts to open up as they share everyday moments in their new home. Their evolving relationship lays the groundwork for a gradual bond as they adjust to being family. (Unreviewed summary by Grok 3)