-Reincarnation, Transmigration
-Reincarnated in Another World
-Reincarnated in a Game World
-Reincarnated in a Book World
-Reincarnated as the Villainess
-Reincarnated as a Side/Mob Character
-Reincarnated in The Past
-Reincarnated in The Future
-Time Travel, Time Rewind, Regression/Regressor
-Transported to Another World
-Summoned to Another World
-Female Protagonist
PART 3:https://www.mangago.me/home/mangalist/682647/
PART 5:https://www.mangago.me/home/mangalist/2405048/
= couples who are blood-related or know each other somehow otherwise
additional are the series in the following lists:
http://www.mangago.com/home/mangalist/6968/
http://www.mangago.com/home/mangalist/7543/
http://www.mangago.me/home/mangalist/8347/?filter=&page=2 (just the Kuroneko series)