Shirakawa Hotaru, who has long been in love with Inami Ken, finally confesses her feelings. From that moment on, the two become a happy couple. However, their bliss is interrupted one summer when Ken meets Tobise Tomoe, a charismatic new friend who happens to be Hotaru’s best friend. With Tomoe’s growing presence, Ken faces a difficult choice: stay with Hotaru or pursue a relationship with Tomoe. If he cannot decide, he risks losing both.