Days with My Stepsister

Yuta Asamura expects his home life to stay simple until his father remarries and Yuta suddenly has a stepsister living under the same roof. That stepsister is Saki Ayase, a girl everyone at school notices, but the version Yuta meets at home is guarded and exhausted, carrying her own history and a careful distrust of intimacy. They both understand what broken adult relationships can do to a family, so they set rules and keep distance, treating politeness like armor. Daily routines turn into quiet tests: who cooks, who speaks first, how to share a hallway without turning it into a battlefield. Yuta tries to stay steady by focusing on school and his part-time job, while Saki struggles with how to rely on anyone without feeling like she owes them something. The tension comes from how normal the situation looks to outsiders and how complicated it feels to the two people living it. Small moments, a conversation after work, an honest admission in the kitchen, a decision to protect the other person’s privacy, slowly change the atmosphere. Their relationship evolves in a space where they are not allowed to be strangers anymore, but they are also afraid of becoming too close, because closeness would force them to name feelings they do not know how to handle.