I asked this question on VNDB but no luck since it's dead. Also, I'm not sure if I should ask this here.

[About Island](#s "On Rinne's route, after the (unnecessary) drama between Rinne and Setsuna about Rinne is going to kill Rinne by going back to Boryujima, can someone explain about what is exactly going on there? The moment Rinne and Setsuna are on Boryujima, I just don't understand the events at all. Such as Rinne pretending and "she successfully killed Rinne" like what?

And also, after concluding their drama, I also just don't get it why Setsuna was suffering(?) on their way back to their home then suddenly Rinne decided to commit suicide.

Another is, what truly happened between Setsuna(Ohara) and Rinne on Boryujima? There's this she was inside the cold sleep machine then there's this she's founded on the beach. So they never used the boat they found in the cave in the first place? Also, was it Setsuna(Ohara) who put her inside the cold sleep machine?")