YOKU

Yoru's twin brother. Since they were kids, Yoku liked doing the same things as his older brother. Ever since Yoru started yoyo, Yoku began learning along with him, but his skill was never a match for his brother's and always fell below, to the point where everyone thought Yoku was just a second-rate Yoru. This made Yoku grow envy and hatred, which led "Night M." to bring him into their clan.