Taisei (u) when middle school thought that Okachimaci was his friend. But, not for Okachimachi. He said "Are we friend?" to Taisei.
After that, their class apart and graduated.
Now, when Taisei in High school, Okachimachi transfer to his class.
Taisei reaaly want to takes his revenge. He want Okachimachi feel the same way with him. The pain of one side thought of friend. Okachimachi even doesnt remember him at all!
Kono Ore Ga Omae Nanka Suki Na Wakenai