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

Cael was very convincing. In fact, when it came to convincing Ginevra to marry him, his tongue was not just silver, but pure gold. And he barely had to use it for speaking.

They didn't waste any time on preparations, either. The very next day, Cael and Ginevra stood in the office of the city magistrate.

The magistrate was the only official besides Ginevra herself, with the power to conduct marriages. Usually, people went to the nearest church for that, but in Cael's case, this was out of the question.

The magistrate's office smelled of paper dust and ink. The only window didn't let much light through, but it was compensated with three magic lanterns that glowed weakly. Their mana reservoirs were clearly the lowest quality possible, or just broken.

Unholy matrimony