This plot is sort of a dumpster fire—I'm halfway through the posted chapters and I swear the time-travel mechanic almost doesn't matter anymore; the relationship progress tends to proceed in ways that seem very odd given whatever just happened; the story does stuff like side-track briefly into stuff like four college kids (i.e. the main cast) buying a bar and getting into trouble briefly with the mafia...?
It has... I don't know, that distinct feeling of having been written by a middle-schooler who hasn't quite figured out how the world works (or relationships!). Some of this may just be cultural translation error and/or my misinterpretation along those lines, mind.
...I do enjoy it so far, though XD