週刊少年チャンピオン
"Penguin Musume" is written and illustrated by Tetsuya Takahashi. It was first published in one-shot chapters in Akita Shoten's "Weekly Shōnen Champion" from April 20 to May 18, 2006. The manga started its regular serialization on May 25, 2006, and finished on November 22, 2007. Its chapters were compiled into three "tankōbon" volumes, released from February 8, 2007 to February 8, 2008.