”Kanojo ga Sensei to Matou Riyuu” is a Japanese light novel series written by Yūya Nakashi and illustrated by Kukumiru. The story revolves around the protagonist, Matou Riyuu, who accidentally discovers that his childhood friend and homeroom teacher, Akiha Rin, has supernatural abilities when he stumbles upon her secret fight against a mysterious organization. As they navigate through this new reality together, their relationship is tested as they uncover the truth behind Rin’s powers and the intentions of those around them. The story explores themes of friendship, trust, and the blurred lines between good and evil in an action-packed supernatural setting.