One day, Karin-chan decided to join the manga club for the mysterious reason of wanting to 'defeat her breasts'. And apparently, she's also aiming to become the world's number one street performer...? This brand new heroine takes the world by storm with her greatest act, her chest. A comedy about a cute little junior and her journey into street performance!

The events of the main story seen through the views of Eriri Sawamura and Kasumigaoka Utaha.

Through a moment of carelessness Totally-not-Marimite fangirl Yuzuriko meets Miyu and is thrown right into the dazzling, fateful encounter she has always dreamed of. But the manga left her ill-prepared for the real deal.