So there was these interesting manga that I had read before, but had forgotten the names. There are three of them.
1. It was one about a girl from a parallel world where ugly people were beautiful. When she somehow got to our world, she met this handsome narcisstic guy. The manga was basically about their interactions and one chapter had her show him a trick mirror and he was convinced that he was ugly.
2. The second one was one about a husband and wife. The two had been in a bad relationship for a while, and one day the husband loses all his memories from when he was a teenager and after. The wife begins to re-fall in love with him.
3. The last one was about a matchmaking machine. There was this guy who works in a convenience store and the head of some company and he begins living with her for money. I remember a reference about a panther and a turtle if that is any help.