In the quiet confines of his study spot at the library, Sakuta Azusagawa has a fateful encounter with a stunning high school girl dressed in a bunny costume. This girl, Mai Sakurajima, happens to be a famed ex-actress and a schoolmate at Minegahara High. What astonishes Sakuta even more than Mai's unconventional outfit is the unsettling revelation that he is the sole person able to see her presence. Intrigued by this anomaly and drawing parallels to his past, Sakuta volunteers to aid Mai in unraveling the mystery shrouding her invisibility. Initially at odds, their relationship gradually blossoms into a deep bond as they navigate through challenges together, evolving from acquaintances to potential lovers. As they delve deeper into the enigma, Sakuta links Mai's condition to the enigmatic Adolescence Syndrome, a phenomenon defying rational explanation and commonly dismissed as mere youthful fantasies. Despite their efforts, the situation escalates, pushing Mai to confront dire consequences beyond mere obscurity. Will Sakuta and Mai successfully decipher the perplexing riddle of Adolescence Syndrome before Mai vanishes from existence?