Two sides of the same coin

A university student named Yuuji unexpectedly encounters a silver-haired boxer named Kou, who kisses him before they part ways. Yuuji assumes they will not cross paths again, but circumstances bring them back together. As Yuuji becomes more familiar with Kou's abilities and flaws, he finds himself increasingly attracted to him. However, Yuuji is soon faced with a surprising revelation that challenges his understanding of the situation.