Son of Ryoji Kazami, an antiques vendor. Spends his childhood negleted in the shadows of his genius older sister Kazuki. However, he ends up traversing an even stranger destiny, starting at his sister's death.

Yuji Kazami's older sister. She used to have brilliant brains and plentiful talents to fit the title of "genius", but has lost her life in the "Takizono Academy micro-bus falling accident". She has showed excessive affection to her younger brother Yuji.

A mysterious man that has many "faces" including that of an art vendor. He is the one that became Yuji's guardian once he lost his entire family, so he could be considered the foster father. Behind the facade, a truly ominous intent was hidden.

A sniper with amazing skill, with her codename being the legendary number "9029". Became Yuji's guardian thanks to a certain incident and acts as foster parent, but passed away several years ago. For Yuji, she is a grand figure that is his master, his mother, and something like a lover.

Yuji's current boss and his "guardian". Childhood acquaintances with Asako from back when they were orphans, and had grown up as compatriots as those that help defend their homeland. Unfit for her flashy appearance, she has very calm decision-making skills.