Osananajimi ga Zettai ni Makenai Love Kome

My next-door neighbor and childhood friend, Kuroha Shida, clearly harbors romantic feelings for me. Petite, adorable, and naturally outgoing, she embodies the dependable older-sister archetype—a trait that makes her incredibly endearing. However, my heart already belongs to someone else: Shirokusa Kachi, the breathtakingly beautiful school idol and an award-winning high school novelist who happens to be my first love. Logically speaking, someone like me shouldn’t stand a chance with a girl of her caliber. Yet, during our walks home from school, she directs her smiles and conversations solely at me, sparking a dangerous hope that my feelings might actually be reciprocated. That fragile optimism shatters completely when I learn the devastating truth—Shirokusa already has a boyfriend. Plunged into absolute despair, I find myself consumed by jealousy and heartbreak, unable to fathom why I wasn’t the one she chose despite being my first true love. Just as I am drowning in misery, Kuroha leans in close and whispers a tempting proposition. Seeing how deeply I am suffering, she suggests they orchestrate the ultimate payback together: the greatest revenge imaginable.