Bunny girls do not live in libraries. This is simply common sense. And yet, that's exactly where Sakuta runs into one in the wild. Sakuta launches an investigation to figure out what's making this bunny girl invisible to everyone around them.
"Forget what you saw today."
There's something odd about Sakuta Azusagawa, an acerbic, standoffish high schooler who doesn't even own a cell phone in this day and age. And perhaps strange things happen to strange people, which is why on the last day of the Golden Week holiday, in a tranquil library, he meets a wild bunny girl. With that unforgettable encounter, their bizarre and mysterious love story begins.