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 and Ingram were at a loss as to how to proceed in the battle. Miller, on the other hand, knew exactly what he wanted: to eliminate both of them and satiate the rage burning within him.

With his newfound form, Miller dashed towards Damian with incredible speed, thrusting his lance forward. The attack was swift and powerful, slicing through the air like a razor.

"Damn it, I'm in trouble," Damian thought, realizing the near impossibility of evading such a ferocious onslaught. Miller had unleashed his full force, intent on disposing of Damian as quickly as possible.

"Die, insignificant human!" Miller bellowed with a raspy and chilling voice.

In that very moment, a strong gust of wind materialized beside Damian, propelling him away from the impending strike. However, Miller showed no signs of stopping. He swiftly redirected his assault towards Ingram, plunging the lance deep into his stomach.

Damian's Transformation! Monster Versus Monster