Misaki Hoshino, a first-year high school student who is the most relied upon in the class. One day, about a month after school started, he decided to bring prints to his classmate Momo Hinata's house, who didn't go to school at all. Hoshino's days begin to change when he meets a girl who has been withdrawn for three years without taking a single step outside. From the inside of the door, there is something I want to tell you --- Two people who don't even know each other's faces, the romantic comedy that opens after school through the door!