Please help me find

Please help me find a Japanese school setting based on this: there were two school boys, one rich (he was the one who died) and the other poor (he is on a scholarship from the family of the one who died). The rich one was always bullying the poor boy, turns out it was just for show. The rich one was found dead by the poor boy, he was arrested. Then there are some characters trying to figure out what and how it happened.

A scene I remember seeing, was when the poor guy kissed the rich kid because he picked a fight with him.

Some characters were on the traditional Japanese attire.

The Poor guy has black hair, I think the rich is Blonde.

I think they had a plan in Autumn or spring something about them seeing sakura together.

There were two detectives, one that's always wearing Japanese attire and the other on English.