Ranmaru Kurosaki

Masato and Ren's master course instructor. Specializes in playing the bass. The legitimate son of the Kurosaki family, which was once one of the three major financial conglomerates. He was involved in band activities after moving to Tokyo, but was eventually scouted by Shining Saotome. Due to his family's downfall and being betrayed by band members in the past, he has a distrustful side.

He has heterochromia with a red right eye and a gray left eye, but the red is actually a colored contact lens.