Seishun Buta Yarou Series

One day, in the library where Sakuta Azusagawa studies, he runs into an unexpected sight: a beautiful high school girl in a bunny outfit. She turns out to be Mai Sakurajima, a famous former actress and fellow student at Minegahara High. His surprise at seeing Mai wear such risqué attire in the library, however, is nothing compared to the shocking realization that he is the only one who can see her...