Btw, does anybody recommend any manga with a good video game system? Most of the time, it's either the MC is so powerful that the game system becomes useless (ex: Re:Monster, kuma, kuma,...), or the game system is just a convenient way to give the MC a cheat but has nearly no impact (ex: Overlord, Kuro no Shoukanshi: you can easily remove the game system and it doesn't change much, it doesn't really justify how the MC grows stronger, it doesn't feel like the MC grow stronger because of the system), or the game system rules change so much that it's annoying (ex: The Gamer, Seichou Cheat de Nandemo, ...)
What I am looking is a manga where the characters become stronger as the story progress and that you feel it's due to the game system. At the same time, the game system has a set of rules well defined, not a convenient way to give something to the MC.
I know of this manga (as of now) and Death Mage doesn't want a fourth time (though it will appear only later)
PS: an easy way to spot them: they regularly show the status menu with skill/stats growing (not just adding new stuff)