Help me find this manga please...

so i only remember a few things...the uke n the seme were in different schools .the uke was a model student n the seme was delinquent leader or something.There school was seperated by a fence and they would have lunch together.the seme's name was probably Zen. it was a really old manga. i m sorry this is not much go with. the name of manga has boyfriend or beast in it or i might be wrong.i really wanna re read it again. plz plz