Regression
Regression? Kind of? Plus somewhat of a system (combat ai integrated into himself). Actually p funny, I like the banter between the mc and the ai
Abilities/system
Loops back whenever he dies
Isekai'd into game, can't remember if it has other stuff it's been quite a while since I read this
None of the above (other than being modern) but it's an isekai so it kind of fits. He's able to go between his world and another via a teleporter tho. I really enjoy this one
System
Regression
Fantasy, reincarnation? I'm only on ch7 (only reading the official translation) so I'm not sure but it seems like it
Messages