Living next door is my childhood friend, Shida Kuroha, who appears to harbor feelings for me. Despite her petite and adorable demeanor, she exudes a warm and caring aura, embodying the Onee-san archetype. However, my heart already belongs to the school's enchanting idol and accomplished writer, Kachi Shirokusa. Realistically, I stand no chance with her. Yet, on our walks home, Kuroha engages me in conversation with such genuine warmth that I start to wonder if there's a glimmer of hope. My optimism shatters when I learn of Shirokusa's existing relationship, plunging me into a pit of despair. As I grapple with heartache and desolation, Kuroha proposes a daring idea—seeking the sweetest revenge imaginable. Could this be the turning point in my tangled emotions?