After MC beat the Great Demon King he used his wish to send his whole class back to Earth. This is where the first time-f*ckery happens as Earth's time is reversed to when they were summoned and Fantasia's time was forwarded 100 years. I really hated this as MC just basically forced his classmates away from their life in Fantasia when most of them were married or had kids and even when some of them returned they all ended up leaving their family and loved ones alone for 100 years.

After that the same wish was repeated by another hero supported by MC since the Earth was destroyed by the evil goddess so it's another +100 years on Fantasia. This wasn't so bad when it happened once but was aggravating how the love interests are pushed back to waiting longer.

On the third round MC made his second wish to go back in time by like 700 years for the whole universe. This was when I was hitting myself in the head cause of how downhill things went. MC had erased every good and bad thing that had happened so far just so he could undo his wife's bad history without any other consideration. He didn't even ask the wife or his son while the other major romance candidates were thrown under the rug and most of the plot became pointless when he could've made that wish from the start.

Was that going to be the end of it? No, of course not because MC goes and makes a third wish to quite literally reset the whole universe to when the evil goddess was born to reveal a hidden secret of how he had had his time reset without his memories once at the start of the story and explaining why everything happened. Everything from this point basically read like a what-if side story of when the MC wasn't summoned and you get a random heroine inserted to become his fiancee.