This world

Five hundred years ago, Mona entered this world. No one knows why it happened. Since then, everyone has gained the ability to view a status window which shows their name, age, rank, strength, speed, agility, mona, intelligence, charm, skills, martial arts, and most importantly, their rank limit.

Animals started to mutate. Your average dog was no longer something you could easily control. Their size, strength, and speed grew exponentially, but their intelligence decreased slightly.

Eventually, humanity learned to harness mona to a certain extent. Mona can be utilized in five different ways: elemental, body, mind, time, and space.

Using mona to control elemental and body functions is quite common, but employing mona for mind, space, and time control is considerably more challenging. Using mona to manipulate the mind is also considered impolite and requires a professional license. As for using mona to manipulate space, it's prohibited unless you possess a professional license. The last time an individual without a license attempted to manipulate space, a massive explosion occurred, resulting in the deaths of 17 people.

From time to time, cracks in spacetime open up, directly connecting small pockets of space to the demon realm. However, instead of seeking ways to close these breaches, people have begun to exploit them. There's a slight risk that these cracks in spacetime could lose their balance and explode, thereby releasing demons from within.

The current world is more advanced than my previous one, but in a different way. Here, nobody uses electricity to power things; instead, they rely on mona for all their needs.

This world contains things that you might not have encountered in my previous world, like potions, supersonic trains, and 4D-space rings capable of storing items in a compact space similar to a video game.