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And that being said, the mc will never know what his companion was like before the island, because of the mana. But she only got mana on the island and they met before. And this treasure that MC got from the waterfall could help him gain control of the incubus. And I hope there are fighting techniques that can be used through mana manipulation. Just like black clover, which at first seemed to rely on just one style of magic, but techniques from other realms emerged.