The story is ok but Zinzin is just a typical Isekai Harem MC, one look is enough for her to " fall in love", she sounds so cheap and easy to get despite how the author beautified it. I think the other 2 guys, if they didn't gave up, she would have accepted them. Her initial refusal with the last ML too is not because she really wants to reject him but because of the promise she made, all in all she never rejected anyone. ** Spoiler alert** She only met the last ML for 2 days, not even 2 whole days as they met the night of first day, then their in a relationship