Gaku broke his arm in a minor accident during the previous school year and got branded as weak and frail, leading to him being bullied. Since then, he's built up his muscles so he could defend himself. Gaku used to be bullied along with his other friends until the day they saw Osoro Shidesu beating up some guys from another school and decided to join her. He is secretly in love with Umeji Kizuguchi and is afraid to tell him. He is rude in front of the others.