Diamonds Cut Diamonds

One night, brash blonde high school student Toraji went to a party with his childhood best friend, Ryunosuke. At the party, they both got lucky and ended up having a threesome with a cute girl. However, in the heat of the moment, Ryunosuke leaned over the girl's shoulder and kissed Toraji deeply! What's a yankee boy to do when he realizes his best friend is in love with him!?

This volume also contains "ONE ON ONE", a story about a delinquent's first love with the delinquent senpai he needs to fight!