Seishun Buta Yarou wa Bunny Girl Senpai no Yume wo Minai

Seishun Buta Yarou wa Bunny Girl Senpai no Yume wo Minai manga summary: Azusagawa Sakuta is a high school sophomore who, due to certain reasons, lives alone with his younger sister. Unlike most people his age, he doesn't have a cellphone. One day, while visiting a nearby library, he encounters someone who shouldn't have been there: a bunny girl. Adapted from the Light Novel written by Sakurasou no Pet na Kanojo combo.