Ryuichi Sakuma, Gravitation Wiki

Ryuichi Sakuma (佐久間竜一 Sakuma Ryūichi) is the lead singer of the popular band Nittle Grasper along with Touma Seguchi and Noriko Ukai, and friend of Shuichi. He left the band three years ago to pursue a solo career in America but returned to Japan to reform Nittle Grasper. Shuichi is excited at the news of Nittle Grasper's reunion, but that now makes Ryuichi his rival. Ryuichi is kind and sometimes seems to have the mind of a five-year-old, until he starts singing; then he becomes a really cool

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we could be immortals — “They call him the worldly Sakuma Ryuichi.”