ビッグコミックスピリッツ
"Homunculus" is written and illustrated by Hideo Yamamoto. It was serialized in Shogakukan's "Weekly Big Comic Spirits" from March 17, 2003, to February 21, 2011. Shogakukan collected its chapters in fifteen "tankōbon" volumes, released from July 30, 2003 to April 28, 2011.