Clock Tower: Ghost Head

Released internationally as Clock Tower: The Struggle Within, this survival horror point-and-click adventure game is considered a spin-off in Japan, where it was not a numbered release. The story follows 17-year-old Alyssa Hale who suffers from multiple personality disorder with an alter ego named Mr. Bates. The player must guide Alyssa through various environments, altering between her normal and twisted personality, to uncover the secrets of her and her family's past. (wikipedia.org)