A certain app was installed on the smartphone of Yuukei Nagino, a high school student who had given up on having a proper youth. The app was called “Youth Matching App.” It rewards you for completing missions designed to help you experience a “proper youth” with your matched partner. And his match turned out to be none other than Hana Hanamiya, the beautiful girl from his own class. She wants to complete the missions in order to make her own dream come true. To discover what youth really means, and to make Hana’s dream come true, Yūkei carries out the missions sent to him—but… A youth school romantic comedy that begins with a mysterious app!