Hanyuu is a part of Rika's mind. And Rika hates her so much that she physically removed the brain from her body just to get away from her.
Worst end. Game uninstalls itself and your computer goes to sleep. Your machine's serial number is blacklisted and can never reinstall the VN again. It is your fault.
ok, so they are from the same creator of mr hat&koishi adventures ... also 1st time the pool "how is that even possible?" made me laugh just because i noticed it