Shinya balances running a struggling cafe with the chaotic demands of his two step-sisters, Chika and Chiori. Between financial mishaps caused by their eccentric boss and supporting their coworker Aya through a heartbreak, Shinya is forced to confront his feelings when the sisters are scheduled to move to America. After a desperate and embarrassing dash to the airport, Shinya is overjoyed to find that his sisters are staying in Japan, promising more heart-fluttering days at the cafe.
The protagonist finds himself caught in a romantic tug-of-war between his non-blood-related sisters, Chiori and Chika. After a series of secret romances and a heartbreaking departure to America, the twins return with a bold new resolution. Refusing to let their bond or their love for their brother be split, they confess their shared desire for him, proposing a daring relationship where they can all be together.