I am looking for a manga in which initially the main character is a bad guy and through the story goes from bad to good. I would like it if it was seinen and the story should be mostly about redemption and correcting past mistakes.

Onani Master Kurosawa

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My current top 3:
Fullmetal Alchemist
Pandora Hearts
3-gatsu no Lion

Shikeishuu 042
Koe no Katachi
Six Half
Ore ga Doutei o Sutetara Shinu Ken ni Tsuite Kinda... The MC wasn't really evil but was a womanizer and it's shonen

dont have anything that is exactly like that but there are some that are close

Kurenai Ouji -kinda, he is a demon that was supposed to kill her but changes and ends up not being able to do it

Gakuen Alice -though he is the second MC and he is not evil, just cruel because of what happened to him. his change is more gradual and it turns into a really cute romance

Superior -this one probably fits the most, she is the demon king and if following the hero that is supposed to kill her around because he interests her and ends up turning good

ill also second Koe no Katachi


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Like educational manga? take a look at Ed U. Manga's list of manga here

Yamada and the 7 witches is Good and Funny

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(A Must Reads)
-Dead Tube
-Shokugeki No Souma
-Terra Formars
-Ballroom e Youkoso
-Kono Oto Tomare!
-Bokura wa Minna Kawaisou