Groundhog Day loop. Close enough - his consciousness will live for as long as Riha continues to choose to send him back. And she seems to have grown attached to him, so this could last for... quite some time, subjectively speaking.
Normally I'd say the human mind isn't fit to handle this sort of thing, but after our protagonist pushed through the pain of using the time-travel powers for himself, he may be just inhuman enough to cope with spending an eternity with this kinda cute alien-ish girl. And she's already managed to figure out how to cook!
I'm alive...
The heart attack came at 10PM and then I lost consciousness, certain that my fate has finally caught up with me.
But instead, I was returned to 4 days ago. It doesn't take much to guess just whose doing it was that I'm still here.
It means all I've done thus far only helped to postpone my eventual end...March 26th (Sat) Rain