A young man named Sakuta Azusagawa is studying in the library until his attention is drawn to a wandering girl in a bunny costume who is seemingly invisible to those around her. As it turns out, this mysterious bunny girl is a celebrity and Sakuta’s classmate, Mai Sakurajima. Determining this strange phenomenon is part of what Sakuta refers to as Adolescence Syndrome, he befriends the girl and sets off on a journey to make the world see her again.

Hitomi Tsukishiro is a seventeen-year-old mage living in a future Nagasaki. Much like her grandmother and other family members, she has the ability to use magic. Despite this magnificent talent, she was born with a stale sense of the world reflected through her color blindness. Her grandmother, wanting to help, utilizes her powerful magic to send Hitomi back in time to 2018 so she can attend school with her grandmother when she was also seventeen years old. What does her grandmother expect to achieve by sending her into the past?