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

This was the strangest thing—Arca didn't sense a thing out of order in Irmilla's room when he heard the thud. Not at first—and then he felt her aura flickering weakly.

Armor of Angels coalesced into being as Arca dashed out of his room. Romeo was right at Arca's heels.

The door to Irmilla's room was locked, but after the first failed attempt at opening it, Arca didn't hesitate a moment before bashing it open. A single strike with a steel-clad fist was all it took to break the hinges.

The door flew forward with more force than Arca expected, landing with a loud crash. At the same time, a powerful gust of wind pushed Arca forward with a force he didn't expect. It wasn't a spell—or at least, Arca felt no mana from it—but it was powerful enough to send him tumbling into the room.

Then Romeo crashed into Arca's back with a shout of alarm, and they both fell to the ground with the clang of Arca's armor.

EW. Beautiful death