Oni Wa Warau Ka summary:

From Must Be Endless:Set in an ordinary middle school – Hoshitani unexpectedly comes across a love affair between his gym teacher and his frivolous classmate, Kashiwase, and becomes interested in him thereafter. When he finds himself alone with Kashiwase, Kashiwase teases him, but Hoshitani begins to notice the loneliness between the cracks of his confident appearance...