An idol under TSUKINO TALENT PRODUCTION. He is a member of the unit ROCK DOWN.

Gaku is a tall young man with short black hair, with some bangs falling over his left eye as well as an ahoge, and light green eyes.

Gaku has a parental attitude, often jokingly called the "mother" of ROCK DOWN. He is a man with incredible patience and is not easily agitated or flustered. He is calm and helps guide others in the right direction. He is especially skilled when it comes to cooking and acting. Gaku is also a casual drinker.

Gaku is shown to be somewhat insecure when comparing himself to the extremely talented members of VAZZROCK. He worries about being overshadowed, or fading into the background amongst others, so he compensates by working extra hard to catch up to them, and eventually surpass them.

(Source: TSUKIPRO Wiki)