​Takumi, Mitsuki, and Satsuki have been inseparable since childhood, doing everything together. Soon, their dynamic takes an unexpected turn when Takumi’s father, Kazuyoshi, introduces two new girls, Saori and Yui, into their lives. As they all coexist under one roof, a unique bond begins to form, blurring the lines between friendship and something more intimate. Join these friends on a journey of self-discovery and exploration as they navigate the complexities of their evolving relationships. In this heartwarming tale, affection blossoms and boundaries are pushed, forever changing the dynamics of their once-innocent friendship.​