Ryongul

[Mature Content]

[NO NTR]

The day dungeons appeared on Earth, everything changed! From ordinary beasts to monstrous ones, attacks were common throughout the globe, and no one was safe.

After countless studies using these beasts as subjects, Humankind developed a serum capable of awakening incredible abilities in humans, leveling the battlefield.

With the serum came heroes and villains, those who wished to use their powers for good or bad.

The Garmony Upper School was a place for the elite with the sole purpose of creating heroes to fight the villains and explore more of the dungeons after the beast attacks increased for no apparent reason.

Damian Romero, a youth who received the serum after turning 18, yet got no unique ability. It was not uncommon for one to not receive power, but it was still a blow to one's pride.

He went rogue after the news, drinking alcohol and having a good time with women, and it was at that moment, when he was putting his toy to play, he got a surprise.

[All-in-One System Unlocked]

Damian's unique ability was a system with multiple functionalities, but after he studied it, it seemed this system worked with a different type of coin called Erotic Coins!

Improve his body? Buy any item or unique ability from his system's store? All Damian needed was Erotic Coins, and he knew how to earn them!

~~~~~
The MC will not start as a villain, but something will shift his mind in the future.

All-in-One System: All I Need is Erotic Coins

Damian's friends were likely worried, wondering where he had gone. He hadn't informed anyone and had dedicated all his time to learning the magic called Anchor. It was no easy task, but with the help of his newly acquired ability purchased using Erotic Coins, Damian significantly improved his learning rate. After sixteen hours of constant training, he finally succeeded.

Returning to the temple within the canyon, Damian's friends approached him. "Damian, where have you been?" asked Aurora, her face filled with concern, imagining the worst.

Natasha and Lila were there, engaged in training, while the others were occupied with their own matters. Placing his hand on Aurora's shoulder, Damian reassured her, saying, "I'm okay, calm down. I was formulating a plan to deal with the demon, and I think I've come up with something. I'll be away for a few days to see if it works out."

"But we can help! You don't have to do this alone," Aurora insisted.

Massacring a City