Nee, Sono Tsuzuki Misete yo

A high school boy is shocked when his little sister stumbles upon his hidden collection of adult manga. Expecting anger or disgust, he is instead met with her curious and playful interest. She asks him to show her more, turning an awkward discovery into a shared secret. As she becomes increasingly fascinated by his hobby, the boundaries of their sibling relationship begin to blur. The brother must navigate this new dynamic, where her innocent support challenges his comfort and forces him to confront the implications of her involvement. Their interactions grow more intimate and complicated, leading to a series of embarrassing yet tender moments that test the limits of their bond.