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

Like Cael expected, Father called for him and Ginevra in the morning—after a breakfast that passed in the same atmosphere as the dinner.

Mother explained in no uncertain terms that war councils of any kind were not something she wanted to take part in, nor did she think she would be of any use there. Vittorio, though, seeing that he wasn't included, became dark as a storm cloud.

Cael looked at him and remembered himself. He, too, was excluded before… Until he got power. He could only imagine how Vittorio would feel—he was the star of their father's eyes until only recently.

And maybe there was some brotherly rivalry between the two, but what of that? When they were children, Cael would push Vittorio in the mood, and when they were older, Vittorio would Summon Water right over Cael's head; but in the end, they laughed together.

So Cael said, addressing his father, "Let Vittorio come with us. He might have some ideas about our problem, too."

The cunning plan, part 1