[Jimmy C]

Originally Posted by Klashikari

Ironically, if Satoko's unhappiness doesn't happen (so if Rina isn't killed), it can lead to Rena's unhappiness, so Tsumihoroboshi-hen.

Is it like this?

Spoiler:

If Rena's father refuses Rina, she winds up needing to make a quick escape but fails. Leading to Tatarigoroshi-hen. If Rena's father didn't refuse her it leads to Tsumihoroboroshi-hen.