Hiro Mashima's PlaygroundHiro Mashima's Playground.

Hiro Mashima's Playground (Japanese: ましまえん, Hepburn: Mashima-en) is a Japanese anthology of manga written and illustrated by Hiro Mashima. It collects eight one-shots originally published in Kodansha's Weekly Shōnen Magazine between 1998 and 2003. The anthology was released as two volumes in Japan in December 2003, and as one volume in North America in 2018.