聖川 真斗

Masato is the oldest son and heir to the Hijirikawa Group. He was raised in a strict environment, making him very serious and because of that, his way of thinking is a little old-fashioned.
He's unable to show his real self due to his serious nature and seems to have some form of rivalry going on with Ren, whom he knows since he was little. He plays the piano.

He shares a room with Ren from Class S and is in Class A.