Yami Zokusei Dakedo Kyakkou wo Abite mo Ii desu ka - Tsuihousareta Shounen Asashin wa Wakeari Yami Bishoujo-tachi to Shin no Yuusha ni Nariagaru

Saving an unfortunate beautiful girl from the scum!

On the day of the celebration of defeating one of the seven demon kings. Noel Wraith, a boy assassin, was banished from the party, saying that the "inferior dark attribute is not suitable for the party of the heroes of light."
Disappointed, Noel meets other girls of the dark attribute who are also suffering from the same unreasonable situation, and they make up their minds. 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 king.