After losing her parents, Akai and Kanie, detectives investigating in Sawa's parents murder, takes the orphan teenage girl under their protection. Sawa is then forced in a relationship with Akai who abuses her. To make things more ironic, Sawa is forced in committing a series of hits for the corrupted detectives. She is ordered to kill suspected child molesters who are targeting young girls. She makes a short appearance in MEZZO Forte at the beginning of the first OVA.
An assassin who lives alone in an old warehouse with stray cats.
Tadashi's mother, age undisclosed, is the director of Private Hakusen Academy. Little is known about her and she never appears in front of the students. A woman whose actions speak for themselves, she is strict and intimidating. She is the primary reason why Tadashi entered the SA class and has threatened to punish him if he gets a lower rank than fifth place. In the past, she frequently punished Tadashi when he failed to please her and does not hesitate to do so in the present when he offends her, often extending the punishment to the rest of the SA if she deems fit. She and her husband were really popular in school when they were still students. As Tadashi stated, his parents always had a boyfriend and girlfriend.
As of the beginning of Hikari's 2nd year of high school, she is tied 2nd place with Iori Tokiwa, the second son of the head of the Tokiwa Hospital. He has a sickly younger sister who has been receiving medical treatment outside the prefecture and has only recently returned to Tokyo. Upon his introduction, Iori's score on the most recent examination results in the rankings of everyone below Hikari to drop by one place. He also wants to get first place, so Hikari sees him as both a rival and a friend. He works part-time in order to earn money for a dream he wants to fulfill, even if it is against school rules to do so, and lives in one room apartment by himself. Iori is apparently striving to become a beautician. (Source: Wikipedia)