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

"You?!" Arca jerked away so quickly that his hat tilted sideways. He hurriedly put it back in place. "What pit of Hell have you appeared out of, and how do I put you back? Can't you just see that I'm BUSY?"

"Signore Santangelo, is that really a way to treat a friend?" Arca's companion asked. "Please, introduce us."

She had a melodious voice that immediately caught Cael's attention. He looked at her properly.

That woman didn't suit Arca at all.

She was a high-born lady–that Cael knew from the first glance at the way she dressed and the way she held herself. She wore a striking white dress embroidered with roses, and a matching wide-brimmed hat that threw a shade over her face. Several strands of blond hair, so light it looked silver in the sunlight, fell from under it.

Ladies and gentlemen