Onee-san wa Joshi Shougakusei ni Kyoumi ga arimasu - Vol. 11 Ch. 64.2 - Extra 2

[T-sama]

Koko's father is alive and I'm pretty sure they're not divorced, but yes, in this kind of series men don't exist. It was simply a ship that never sailed.

Guess the ship was doomed from the beginning cause everyone forgot that detail