Akatsuki EN-Eins is a series of Japanese dōjin 2D fighting games, developed by the dōjin circle SUBTLE STYLE for Microsoft Windows and arcades. It takes place in an alternate 21 century in the year 200X - 20XX, but with a World War II era aesthetic.

Soft Circle French-Bread, also known simply as French-Bread, is a Japanese video game developer founded in 1995 as Watanabe Production , based in Taitō, Tokyo, Japan. Originally a doujin circle, French-Bread became well known for their work in fighting games, particularly the Melty Blood series. In recent years, they worked on other licensed-based fighting games, such as Dengeki Bunko Fighting Climax and the company’s original game, Under Night In-Birth. Most of its developed video games are commonly released for Microsoft Windows, Sega arcade systems, and PlayStation consoles.