Baka na Imouto wo Rikou ni Suru no wa Ore no xx dake na Ken ni Tsuite

Hoping distance would quiet his feelings for his younger sister, Hana, Yuuichi Mitsui enrolled at a university far from home. Distance was supposed to fix things. It didn't. Then she shows up at his door one summer morning, looking more grown-up than he remembered, and suddenly all that careful separation means nothing. The twist that makes this more than a straightforward forbidden romance setup: Hana is physically mature but mentally childlike, which puts Yuuichi in a genuinely uncomfortable position. He knows better, he feels guilty, and yet here they are, stuck together for the summer. That internal tug-of-war — wanting something and knowing you shouldn't — gives the early episodes a tension that goes beyond the obvious. The character work leans into the contrast between Hana's appearance and her innocence, and the show doesn't shy away from making Yuuichi feel the weight of that conflict. If you've seen Boku wa Imōto ni Koi o Suru and wanted something that leans more explicitly into the adult side of that forbidden dynamic, this covers similar emotional territory with less restraint. Fans of Imouto Paradise! will also find familiar ground here in terms of setup and tone. It's a 4-episode OVA adapted from a visual novel, so it moves quickly and keeps its focus tight. Go in knowing what it is — this is a mature title that doesn't pretend otherwise.