On the fateful day when dungeons emerged on Earth, everything changed. Ordinary beasts transformed into monstrous creatures, launching widespread attacks across the globe, leaving no one safe.

After extensive research using these beasts as test subjects, humanity developed a serum that awakened extraordinary abilities in individuals, evening the odds on the battlefield. Alongside the serum emerged individuals as heroes or villains, each wielding their powers for good or evil.

The prestigious Garmony Upper School became a sanctuary for the elite, dedicated to training heroes who could combat villains and venture deeper into the dungeons, which inexplicably witnessed a surge in beast attacks.

Damian Romero, a young man who received the serum upon turning 18, found himself devoid of any unique ability. Although not uncommon, it dealt a blow to his pride. Disillusioned by this revelation, Damian embraced a rogue lifestyle, seeking solace in alcohol and indulging in pleasure with women. However, it was during one of these moments, while engaged in play, that he received an unexpected surprise.

[Unlocking the All-in-One System]

Damian's unique ability manifested as a system with diverse functionalities. Upon studying it, he discovered that this system operated with a distinct type of currency known as Erotic Coins!

Enhancing his physique? Acquiring coveted items or unique abilities from the system's store? Damian realized that all he needed were Erotic Coins, and he was determined to earn them by any means necessary!