Mashiro Mai attends Hae Academy and is a member of the Swimming Club. She is very beautiful, popular, and has a cheerful personality. She has short blue hair, violet eyes, and is busty-petite. She is in the same class as the protagonist, Tomohiro Machiya. Not much is known about her past.

She has feelings for Tomohiro, as she takes his first kiss and tells him she is still a virgin after he records their first video.

This is later reinforced when one the killers during the Rascal (island) arc will not accept her as a substitute for the young girl, as he only kills "sluts" (anyone who has lost their virginity). It is later revealed that she first started watching Tomohiro when they were young, and has loved him since, though his memory of this time has faded.

Not much is known about her past.

It is revealed in chapter 27 that in her first Dead Tube upload (now only visible by VIP members) she murdered her mother, father, and sister for reasons not yet known.

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