Garessta

In this world riddled with strife, where even kids know spells, and powerful mages are nobility, Cael was born with no mana at all. An heir to the family of mages, he was his father’s disappointment, and his city’s laughingstock. But who knew that he had a much different destiny? To prevent a looming catastrophe no one else knows about—to stop the Starspawn. 

“Blood Mage System activated. Greetings, user. I am your Blood Mage System. Consume the blood of powerful creatures to purchase new abilities.”

With that power, Cael will become a hero able to stand against the fate that crushed countless others—even if the world will call him a demon instead.

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Although the novel has a harem and r18, neither are the focus of the story. Cael only has very few (2 right now and at the moment I don't plan on increasing this amount) girls, and there aren't that many r18 scenes. Take that as you may~

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My Blood Mage System

'Don't you ever get lonely in my head, System?'

Cael didn't know himself why he asked that question of them all. He never thought to consider the System as anything person-like enough to experience these… feelings. Even after it declared itself able to do so.

It was much easier to deal with a talking tool living in his head than with another person. A tool that Cael might have felt some attachment for—like a musician might for a favorite lute or a gambler for a die that brings him luck—but no more.

Now Cael wondered if he shouldn't have asked. But to his relief, System kept its usual upbeat attitude.

'Oh, no, Cael. Was that question an expression of worry? If so, you shouldn't feel these things! It would've been incredibly illogical for me to make myself able to experience longing for things I am unable to obtain. That would slowly destroy my mental wellbeing and, thus, my capability to aid your efforts. No, I'm perfectly content being as I am.'

Human ambition, human limitation