Kuroha's been waiting since childhood for Maru to see her, and the show knows exactly what that silence costs. Every comedic moment lands because it's built on the terrifying fact that the girl who loves him most has everything to lose if he finally looks her way. The premise sounds like every other romcom, but it's actually about what it means to be the person nobody chose yet, watching the person you chose chase someone else.

Maru Sueharu has fallen for Kachi Shirokusa, a beautiful school idol and award-winning high school author, even though he knows she should be far beyond his reach. After she smiles and talks only to him on the walk home, he starts to believe he has a chance, until he hears she already has a boyfriend. Maru is left wallowing in disappointment. His cheerful, caring childhood friend Kuroha Shida, who lives next door, has already told him she has feelings for him, and he turned her down because he was set on Kachi. Now, seeing him crushed, she comes to him with a proposal of her own: that the two of them get revenge. What follows is a romantic comedy built around a childhood friend who refuses to lose and the school idol who broke Maru's heart.