The Comic Artist and His Assistants

The Comic Artist and His Assistants (Japanese: マンガ家さんとアシスタントさんと, Hepburn: Mangaka-san to Ashisutanto-san to) is a Japanese four-panel manga series written and illustrated by Hiroyuki. It was serialized in Square Enix's seinen manga magazine Young Gangan from February 1, 2008, to September 21, 2012, and the chapters collected into 10 tankōbon volumes.

Source: Wikipedia — The Comic Artist and His Assistants (CC BY-SA 4.0)