I'm looking for an older manga. It's in a boys school. The Joe is really pretty and hate...

I'm looking for an older manga. It's in a boys school. The Joe is really pretty and hates being hit on. He finds peace in the biology lab where a quiet guy spends a lot of time. The guy arranges a place for him to nap, brings him bentos and gradually wins him over. It's the last in a series if I remember right.