Renjaku-san to Asobo

Junpei Sakai, who lacks self-confidence, meets a mysterious young lady named Yukari Renjaku at the high school he enrolls in. She says she "came to high school to have fun," and Junpei decides to hang out with her after school. But Renjaku-san seems to be hiding a secret...? The secret after-school life of a free-spirited and mysterious young lady and a boy with no self-confidence! (Source: Akita Shoten, machine translated)