[Seronei]

Originally Posted by Draugur

Spoiler for Rika's parents:

But somehow it seems he doesn't really care, neither does Rika, at least it is never really mentioned.

.

Spoiler:

It's stated that Rika gave up all hope on her parents surviving, so presumably in any of the worlds we're shown she just doesn't care about her parents. She just wants Satoko to survive, if she also refused the experiments they had no reason to kill her parents but it would lead to Satoko dying.