Saving an unfortunate beautiful girl from the scum!

On the day of the celebration after defeating one of the seven demon lords. Noel Wraith, an Assassin of Dark, was suddenly banished from the Hero of Light's party who only tolerated his presence as a replaceable necessity because "We of the Light are your antithesis".
Shattered and abandoning his "foolish dream", Noel ventures alone far from town only to quickly meet Rococo, a Curse-Maker of Dark, who's suffering from even worse mistreatment. Together, they decide to form their own party and become heroes who can save the world. Meanwhile, the heroic Party of Light, without understanding the true meaning of Noel's absence, sets out to defeat the second demon lord.