Osananajimi no Kahanshin Jijou

Summary

High school student Kyosuke, who despises his long-time rival, Eishi Takano, who has done nothing but make him cry since they were kids!! He told Eishi he’d get his revenge someday. One day, Eishi takes him into a toilet stall and teases him until he cries again. To make matters worse, Eishi tells him not to cry for anyone else...!? (Source: Renta!)