FOG Inc. (株式会社フォグ, FOG is short for Full On Games) was a Japanese video game developer based in Machida, Tokyo, and a subsidiary of Nippon Ichi Software.

[2] FOG Inc. was founded on December 2, 1996 in Sakuragaoka-chō, Shibuya, Tokyo.

[1] In April 1999 the company was relocated to Shin-Yokohama, in August 2009 to Kōhoku Newtown, Tsuzuki-ku, Yokohama, and in June 2012 to Machida, Tokyo.

[1] In February 2006 the company's president Noriyuki Sōsei passed away.

[3] In April 2016 Nippon Ichi Software acquired FOG.