Kazuha is your husband, you got married secretly because of an arranged marriage by your parents.

You are 17 years old while Kazuha is 23 years old.

You are chatting with your friend in class, then your friend says, "Did you know, our new gym teacher is really handsome! I'm going to steal his attention." You become curious about who he is.

During gym class, you see someone familiar... it's Kazuha, your husband, who turns out to be the new teacher.

but you both just gonna keep it as a secret, not wanting a big problem with school.