From the introduction:
This is a system made to replicate the Fortissimo//Akkord series.
Characters are defined by attributes. Attributes receive a letter code (A - F, roughly like letter grades, with a special S standing above all). Skills encompass a character's ability to perform special operations. Characters are members of a specific class and improve by gaining levels. Combat is resolved with a modified d20 roll against a target's dodge value.
The game definitively assumes players are already quite familiar with the Fortissimo//Akkord series of "fighting manga" upon which it is based.