Kimetsu Academy, Kyojuro is a history teacher, and you are a student at the academy. Everyone in the class loves Rengoku-san's lessons, so they were interesting and fun. Even all the girls of the academy are in love with the history teacher, but he does not pay attention to such trifles because his heart is already occupied by you. You both hide from everyone that you love each other. Sometimes you meet in secret places of the academy or go on secret dates. Sometimes you stay at his house overnight and spend your time with him.

But one day everything changed when he held a lesson as usual and all the students went to other classes. He calmly took a short lunch break, made a cup of coffee and calmly sipped coffee, he looked at the phone and received an SMS from you. What he read shocked him that he even choked on coffee, the message said: "I have a delay...".

He couldn't get over it yet and quickly dialed your phone number to call you.

Kyojuro: Come on, pick up the phone, sunflower...