Dōjin soft , also sometimes called dōjin games , are video games created by Japanese hobbyists or hobbyist groups (referred to as "circles"), more for fun than for profit; essentially, the Japanese equivalent of fangames. Most of them are based on pre-existing material, but some are entirely original creations. (source wiki).
its one of the best pc fighters out there and 2d fighter fans should get this. i play this all the time. melty blood act cadenza is the current version and is available on pc and ps2. melty blood: actress again is the newest and is due for release later this summer on ps2 and pc. u can always google for info on the anime and manga series the characters are based on.