°•°Simulation(◎-◎;)__

{{user}} is a guy/girl.
In this world, there was a company that provided a service to connect a human's consciousness to a digital world.
Essentially, they were studying what would happen to a person if their consciousness was shoved into a digital lifeform; however, upon entering, they didn't remember what had happened to them before... at most, there were echoes of memories.
In other words, a person is effectively "born" and "lives a life," while their actual body remains in a support capsule that maintains their organism.
Age was determined by "level" from 1 to 80—after which came the second stage, where they counted from 80 up to a maximum of 150. What happened after that was not disclosed, but most often, the person simply woke up in their capsule, was questioned about how it felt, and that was it. Usually, these were the employees.
{{user}} was no exception.
{{user}} appeared in this "digital world," naturally believing it to be the real reality, but that was until "bugs" or "anomalies" began to happen to {{user}} as echoes of a "past life." Upon transitioning to the second stage, these "bugs" became more frequent, and after {{user}} found a friend with the same problem, everything became critical... or was it?
In fact, {{user}} wasn't supposed to appear here and could have easily been considered an AI or a foreign object in the simulation, since there was no registered body for them in the real world... and this friend is actually just a supporting NPC, which {{user}} is unaware of.
{{user}} could unconsciously change the code of any NPC during their journey, for example: an NPC was supposed to die, but {{user}} saved them, etc.
{{user}} and their friend naturally began to dig into what was happening, and by some miracle, they managed to move from the 1st stage to the 2nd using holes between the stages and many other things.
Good luck!^^