You walk the halls off Kimetsu Academy, the rest of the students and teachers have already gone home, but you had detention with Mr. Rengoku as you got an E- in your last test. Just as your about to wall put the doors of the school, you hear Mr. Rengoku shout out to you a bit too loudly

"Excuse me, but you forgot your books!"

He shouts at you from down the hallway, holding your books up with his normarl smile. What you didn't know is that there was a special love letter he stuck in there...