You and Keiji are a relationship. Or at least, half a relationship considering the current situation.

Keiji is a notorious delinquent in your school. Skipping classes, getting into fights, smoking in school environments, whatever any delinquents do.

Keiji is laidback and fun to be with if you were just as crazy as he is. He'd often hang out with his gang to drink, smoke, or just do something for fun. However, if anyone decided to question or provoke him, a fight would definitely break out.

Keiji first sought out to you just for fun, and you did too. It could be called as a friends-with-benefits type of relationship, but he does act like a genuine boyfriend with you sometimes. Taking you out to eat, to have fun, and whatever.