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CAFFEIN (カフェイン) is an illustrator known for creating Yowane Haku, an official VOCALOID derivative that is recognized by Crypton. Together with Yowane-P, the very "first" video of Yowane Haku became popular with over 400,000 views (a parody of Miku Miku ni Shite Ageru, horrible version).
CAFFEIN also provides illustrations to producers, mostly Haku Yowane illustrations; many of the works have achieved over 100,000 views. Examples are samfree's Megu Megu☆Fire Endless Night and Bokko boko ni Sareteru yo.