Yoiko (Studio Pierrot, 1998/99) Original Animation Cel of Yoiko Yoiko (よいこ, "Good Girl") is a Japanese manga series written and illustrated by Yūgo Ishikawa. It was serialized in Shogakukan's seinen manga magazine Weekly Big Comic Spirits from 1996 to 2001, with its chapters collected in 15 tankōbon volumes. A 20-episode anime television series animated by Pierrot was broadcast in Japan on TBS from November 1998 to March 1999. Original hand drawn by the animators for the production of one episode of this famous serie. See images, very good.