Eternal Fighter Zero

Eternal Fighter Zero is a 2D doujin fighter developed by Tasofro, better known for developing Immaterial and Missing Power and Touhou Hisoutensoku. The colourful cast of characters are originally from the visual novels Moon, One: Kagayaku Kisetsu e, Kanon, and Air. Many of the characters’ attacks reference other fighting games such as Guilty Gear, King of Fighters, Last Blade, and many more.

EFZ version 1.x. It was released by Twilight Frontier on December 2001, during Comic Market 61.

There were 12 playable characters in this version, with 6 characters coming from ONE (Mizuka, Rumi, Akane, Misaki, Mayu, and Mio) and another 6 from Kanon (Ayu, Nayuki, Makoto, Shiori, Mai, and Sayuri). UNKNOWN from ONE was used as the final boss.