HELLLLLOOW

These are the more popular ones that you might have probably read already.

Blood Link (main story is the parents story and the 2nd story is their child's story)
Door to door side story of window to window (the friend's story)

https://www.mangago.zone/read-manga/never_understand/

https://www.mangago.zone/read-manga/kashikomarimashita_destiny/

https://www.mangago.zone/read-manga/mr_100_perfect/

https://www.mangago.zone/read-manga/bbanana_scandal/

its actually "room to room" and not door to door :>

Ohmyghod im wheezing how could I have not noticed that