My Shapeshifter Girlfriend
Finally accepting the Demon Goddess' offer, he ascends to the position of the Demon King.
He grew stronger and the Demon Realm grew alongside him.
He learnt to make new Devils and forge Devil artifacts, which were supposed to be extinct.
Everything was going well but what?
"Why didn't you tell me sooner?!"
"It was just a suspicion."
"Suspicion or not, don't you think that the fact that my girlfriend transmigrated into this world alongside me was something I might want to know?!"
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Tags: Righteous MC turns Villain and then OP, R18, Kingdom Building, Magic, Tragedy, Transmigration, Action, Level Up, Romance, Action, Nonhuman Lover, Sentient Monsters, Fight Divine Beings
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Cover photo depicts the ML (In future - somewhere after chapter 100, how far after? I'm not sure yet)