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 gods lived in a hall that, compared to most rooms in the Inverted Tower, was spacious. By Cael's own impression, it was small—barely ten meters wide and long, but despite that, lavishly decorated.

Its walls and floors were smoothed and carved with crude engravings. Two scared fettas were hiding in the corners behind clay pots in which some mushrooms grew. The floor was covered with furs and straw mats.

Near the back of the room stood a massive beast. At least as big as a horse, it was nothing Cael had seen before. It looked like a giant wolf or a similar predator, but with a shorter snout and a smooth forehead. From the middle of it jutted a single saber-like horn. The entire creature was covered in thick, black fur.

Cael and Ginevra stopped in the doorway, tensing. The creature looked away from the sheep-fettas and turned its bright yellow eyes at them.

'Have you ever heard of a monster like this?' Cael asked Ginevra.

Many-named, part 1