is a Japanese manga series written and illustrated by Masakazu Ooi. It has been serialized in Shōnen Gahōsha's seinen manga magazine Monthly Young King (later Young King OURs GH) since December 2008.
Premise
Publication
Written and illustrated by , Oku-san started in Shōnen Gahōsha's seinen manga magazine Monthly Young King on December 19, 2008. The magazine was rebranded as starting on August 16, 2013. Shōnen Gahōsha has collected its chapters into individual tankōbon volumes. The first volume was released on September 18, 2009. As of March 15, 2023, 20 volumes have been released.