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I'm not too sure about manga but it sounds similar to this one that I'm currently reading.
http://www.mangago.zone/read-manga/so_that_s_how_the_saintess_became_the_devil_of_revenge/
Please keep this updated I would love to find out what manga it is.
Thank you. This is the one
I forgot the name, it's a shounen manga. There was a hero. He and his party fought the dark lord and won. Then the bitch princess and her aides kill the party members and then they accused the hero with treason. After his execution he came back to life with the help of a goddess. And he started to take revenge from those people. One of the villains was a cannibal general, another one was an evil scientist etc.
Anyone knows it?