 If you liked
Nozomanu Fushi no Boukensha
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 ...then you might like
Ghoul ga Sekai wo Sukutta Koto wo Watashi dake ga Shitteiru
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Both are Ghoul like beings and also do adventure stuff sometimes with a female character with them.
Both are not Isekai they are just reborn/turn into a Monster by an effect of there respective world just that only one of the MC knows what happen and the other has amnesia.
One has mature theme and the other is slow paced.
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Recommended by AkatsukiUlquiora