Completely shutting out the outside world with a mask!!! One day, Suzu, a gloomy college boy with no friends and poor communication skills, loses his one-of-a-kind, precious mascot, "Kappa-chan." While looking around desperately, the one who picked it up and called out to him was the popular and handsome playboy, Sasamuro Aiji, with pretty girls in tow. Though he wanted to get it back quickly and flee the scene, Aiji deliberately teased him and wouldn't give it back, making Suzu cry.

Suzu managed to get Kappa-chan back, but on top of dealing with kind of person he most disliked, Kappa-chan was damaged, sending him into a depression. The next day, Aiji gets involved with him again by using him as an excuse to run away from his fans. With no concern for Suzu's feelings of dislike, Aiji demands his thanks for picking up Kappa-chan. But when Suzu bluntly told Aiji, "A cheery person like you is a land mine!" Aiji suddenly kissed him through his maskー!!!?

The handsome, popular, and outgoing guy x Timid, gloomy boy with no friends and poor communication skills. The love between two polar opposites tied together by the cute and mysterious "Kappa-chan."

Notes:
- Originally a five-part serialization completed on 2021-11-24. It was restarted in 2022-05-23 and again on 2023-11-24