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 fell behind, and soon enough. The forest was a stranger place than it appeared from outside. The mana of the trees flowed in mesmerizing patterns, scrambling Cael's senses. He had a hard time feeling the exact locations of living creatures.

Janus ran ahead and soon Cael couldn't sense him, either. Which would've been alright if he knew where to find any beasts. A dozen minutes of running after Cael was sure that he was moving in circles.

Now he understood what the next hurdle Janus had prepared for him was. Mana sense wasn't enough to not get lost in this forest, not to mention find anything in here. All Cael met were weak beasts that ran away from him as he approached.

He drained blood out of a few, but the amount of mana—Blood Points—in it was barely worth the bother.

On four paws