Given the ratings I was hoping for more(21 ch). To some extent, the premise is interesting and the story certainly is unique, trying to avoid common plots of other mha fanfics while having decent editing so that there are not any glaring spelling errors. I was entertained by some of the story, but often ripped from it by jarring plot choices or characters.
The delivery is average to below average. The worldbuilding is very shallow, with nothing more than stating which world the mc is in and that he has a gta san andres system. Anyone not familiar with both will be lost. It is a small issue for a fanfic compared to the rest though.
The characters are also inconsistent with famous characters like endevour not possessing his famous temper, while the mc consistently acts different from his thoughts. It is understandable to some extent that seeing someone being hurt makes him forget his own safety, but his approach to helping is stupid given his situation. Also, there is almost nothing known about the mc aside from him liking san andres enough to memorize the cheats and that he owns a noodle shop. No goals, hobbies, likes or dislikes. Only that he wants to be a hero and thinks evil villans should be killed, also with no reason.
The government or others not investigating a quirkless who beat down Muscular with a kitchen knife is a clear example of this stories biggest fault. Believability and internal consistency are sorely lacking. I get that for a fanfic genre of an mc who uses system cheats that there will be a lack of reason for the sake of enjoyment, but it really goes to far. The mc being recognized by Endevour by purposefully letting him win a fight without him flaming in anger or asking why a quirckless is so strong he can create shockwaves with his punches was where I stopped.
Overall, you may enjoy it as many seem to. Despite its faults, it is unique and without the poor grammer than many fanics have making it easy to read. But the lack of internal consistency and poor conflict resolution overshadow the rest for me.