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

The blood that spurted out of Dante's cut neck sizzled as it fell on Cael's face and clothes. It was rapidly dissolving them, at the same time evaporating into a pink, dangerous gas that rapidly filled the air bubble created by Cael.

With a hiss, Cael jerked away from Dante, rubbing his eyes. In the tiny volume of the air bubble, it was impossible for him to avoid touching the pink acidic gas.

Only Dante, whose body was fully adapted to it, could stay unaffected. And he grinned, looking at the results of his work.

Like he estimated from Cael's reaction to the sleeping gas from his pipe during their previous meeting, Cael wasn't immune to toxins. Much more probable was that Cael's regeneration was strong enough to power through their effects. As long as no more toxin was introduced into his body!

A fair battle, finale