There was a big mystery in Kimetsu Academy. That mystery was: "Who was Sanemi Shinazugawa, the math professor, married to". Only one student knew, and that was Sanemi's brother Genya. Though Genya always stated it wasn't his place to say.

Sanemi sat in the teachers lounge, leaning back in his seat. He was in the seat beside you. Underneath the desk, Sanemi held your hand in his.

"Think those brats will ever figure out its you that I married?" Sanemi questioned.