Reimu tell a history of panda ( they abandon their weakest newborns probably to ensure that the one left grows well). I don't know why reimu and marisa start to fight and end up killing each other, breaking the little reimu's accessory in the process, the now-converted deibu kills that one for having the accessory broken and dies ... marisa is left without parents and alone, winter is coming he has no food and his parents are in bad shape to be eaten ... so he starves very dramatically ... someone correct me if I'm wrong in something