Sabitsuki (さびつき) is the main character of .flow, controlled by the player. Much like the protagonist of Yume Nikki, she spends the game wandering around her mental landscape and collecting a multitude of effects. Similarly, nothing is explained about her past, or about the things she sees in her dreams.


  • Sabitsuki's name continues the tradition of giving fangame characters a name ending in -tsuki. However, if written with kanji, Sabitsuki's name has a meaning related to the game's events. Sabitsuki (錆つき) means "rust-covered" or "rust-eaten".
  • According to her equipment screen, the skirt she wears is her favorite one and the clothes she wears are her usual clothes.


  • It is theorized that Sabitsuki is slowly losing her mind either from the disease or from side effect of her treatments.
    • The Kaibutsu also seem to have lost their mind as well (aggressive ones) or are on the verge of losing them (passive ones) which could further link that both Sabitsuki and the Kaibutsu are suffering the same disease/side effects from disease treatments.
  • Sabitsuki didn't fit in much at school and was either widely ignored or made fun of. Support for this theory is that going through the corrupted school Kaibutsu will actively chase you with pipes as their laughter fills the halls.
  • The reason that Sabitsuki doesn't want to leave her room may imply that she is quarantining herself because of a disease that she has.
  • Sabitsuki may be a foreigner. Although it is easy to assume she is showing albinism, either from birth or due to a disease, it can also be to contrast her as a foreigner, possibly Caucasian. If the other 'infected' are a twisted portrayal of other Caucasians, it can indicate she has had serious trauma in her home country. Many of her effects, such as Tattoo and Gun, are heavily associated with Westerners (if not the Yakuza, which are also associated with guns and tattoos). Many Americans enjoy owning handguns for intimidation purposes alone, which matches up with Handgun's function. In Japan, it is highly illegal to own a handgun, meaning they are less relatable. The Uniform effect is a pretty standard uniform for American private schools. Another aspect that supports this theory is that most writing that has appeared in her dream world is in English (for example, Sugar Hole), which is the most common language it would be in if her first language was English. This theory relies heavily on the concept that the dream world as well as everything that happens to Sabitsuki is a metaphor.
  • Sabitsuki may have been a prostitute and was (or is) pregnant as a result, said pregnancy being unwanted, and she went to the doctor to have an abortion, however, it was either botched or was performed with unsafe means, leaving her with damaged organs and a severe infection.
    • Another theory is her mother could be a prostitute and either Sabitsuki was viewed as unwanted, was born unhealthy due to being exposed to diseases in utero, or that her mother, pregnant again, died from an unsafe abortion (if not childbirth).
  • A theory is that Sugar Girl might be her mother (or sister), who committed suicide or had something tragic happen to her and that Sabitsuki tried to forget.