サングループ
Japanese professional printing company. Prominent among the doujin (fanwork) scene as it provides dedicated printing and binding services for doujinshi authors. Often credited in the higher-budgeted doujinshi fanzines as the printer of the work.

The company's logo is a stylized smiling sun (which rotates in animated versions). This logo will usually appear in the [[colophon]] (i.e. publication info imprint) section on the [[credits page]] at the end of a doujin comic.
sun group (printing company)