Tsuki is an amazing girl, that's why it's a bit weird in her mind. She's a dirty geek, otaku and gamer girl who has psychopath and schizophrenic tendances, and she is bad-tempered... Especially with the human race, actually.
Her imagination is tremendous, that's why she has perverted dreams, or morbidian and bloody ones. This girl, incomprehensible even to her friends, speaks a special dialect that only she understands.
She sometimes talks to herself, but maybe is she talking to a spirit or a SM-Bondage-Hentai.