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

"Now, imagine that you are in a tower with twenty floors. All of them are empty, except for one, where an enemy is locked in. Because he masks his mana, you can't sense his location, but you can pick any number of floors at once and ask the tower's enchantments if the enemy is in any of them. The answer can be only 'yes' or 'no'. Can you find the enemy by asking only five times? Assuming that you are very unlucky, of course, and won't guess right by accident as long as there are other choices."

Cael frowned, thinking. "Only five times? But there are twenty rooms… Hm. Hm. Isn't that the allegory for your blood testing ritual, Irmilla? You want to tell me that there's a solution in only four questions?"

Irmilla hummed, neither agreeing or disagreeing outward. "I'm sure Arca counts seconds, so you probably better not get distracted…"

As if hearing Irmilla's words, Blood Mage System chose that moment to distract Cael with its voice.

Twenty floors tower