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 opened his storage book and leafed through pages. After a minute of searching—he didn't have a bookmark for that one—he pulled a spare pair of Sending Amulets out of it. Then he looked at the deer-monster.

"Hmm… Although you have more mana than the cat, I'm unsure if you can use it much. But the amulets are some of the simplest magic items. Just pour a bit of mana in it, and think the things you want to say."

Cael offered an amulet to the deer-monster. Confirming the idea that it was understanding them, the deer lifted a foreleg and carefully picked it with two parts of the star-like hoof like with pincers.

The cat meowed again, louder, and made a circle around the deer-monster. The deer-monster responded with a harsh exclamation that resembled a word, but barely. Then it turned to Cael and nodded again.

"If this works, you have my respect," Ginevra muttered.

"You speak like I don't have it already."

Deeper into the rabbit hole