Momoka Aihara is a high school girl with pink hair and a magical voice that can heal broken hearts. In secret, she is a Guardian of Love, tasked with protecting the pure feelings of others. One day, she meets Ren, a mysterious boy carrying a deep sadness. As she tries to help him, Momoka discovers a darkness within him that threatens to erase love from the world. Now, she must decide whether she can save him… or if she must fight him.