Seri suffers from past trauma—one that makes her think, “I want romance, but I don't want a boyfriend.” And one day, she meets someone who feels the same way: Mahiro. The two hit it off and decide to become Romantic Friends who only enjoy the fun, heart-fluttering sparks that come with love. A casual romantic relationship with certain rules attached. Everything's going great, and it even motivates her at work, but... As they get to know each other, deeper feelings emerge. What's more, Mahiro has his own heavy past. She just wants a fun romance, without the pain. But in reality...