We have seen plenty of game related Isekai but here is one I'd like to see and wonder if it exists....

Picture something like the Amagami SS game,
vanilla, just one girl, you lock in on the route and that's it, no triangles, no major drama.

Now imagine the following situation (I am still using Amagami because is fairly known but it doesn't have to be this game).....all the protagonists from their winning route somehow go back in time from the end of their route to the beginning.....so now they are all pining for the MC........

What would happen?

And no harem ending.