A girl named Mariko, who leads an ordinary and diligent school life with a hobby of reading, and Akko, who loves to dress up and be a bit flashy. Until now, the two have had no connection, but an unexpected event brings them together as best friends?! Gradually, Mariko begins to develop feelings for Akko that cannot be contained by just calling her a friend. A heart-pounding, exciting story of genuine friendship between girls in a pink-tinted world!