Tonari no Ren-kun wa Chotto Kowai My Classmate Ren-kun Is Kinda Scary

Synopsis

The aggressive Ren and serious Tadaomi have been inseparable since elementary school. And even though Ren is kinda scary, he instantly melts when he's with Tadaomi. Everyone around them knows how they feel about each other... except for the two of them! (Source: Animate International)