Tokaku Azuma is a Japanese 15-year-old Student at Myōjō Academy, with both her short hair & her eyes in an icy shade of blue. She also stands at 169cm & has a B cup size.

Tokaku was born into a well known family of assassins, located in Nagano (Matsumoto). They say that the east's Azuma & the west's Kuzunoha are 2 assassination clans that existed in Japan since the Heian period.

Tokaku's mother died shortly after giving birth to her, leaving her under the care of her grandmother. From an early age, she was trained in the assassination arts of the Azuma. Her mother was supposedly a reputed practitioner within the Azuma, whereas her aunt, Mako, was a disgrace who could not become an assassin. When Tokaku was born, her mother pled for her aunt to ensure that Tokaku did not grow up like she did.

Therefore, Mako tried to persuade a young Tokaku to leave her grandmother's house & come live in the city with her, but Tokaku's grandmother intervened & called Mako "the disgrace of the Azuma Clan". Mako then took more drastic measures & tried to spirit Tokaku away from the Azuma household.

While they are escaping, Mako takes Tokaku to the family shrine where she tells her that her mother will always be watching over her, preventing her from killing. Unfortunately, they were caught by her grandmother before they could escape, & Mako is killed before Tokaku's eyes.

At some point, Tokaku's grandmother dies & she is enrolled in Academy 17 before being transferred to Myojo Academy.

Tokaku is the only known heir & the only known still living member of the Azuma Clan. It was stated that Tokaku has no living relatives anymore, & her father's assumed to have died from unknown cause.

Tokaku is a distant & cold girl, who dislikes it when people comes too close to her, & she especially hates it when people call her by her first name. At first glance she looks more like an assassin who would kill anyone for anything.

Tokaku is a competent & strong girl, but lacks certain social skills, often coming off extremely cold & unapproachable. She often plays into this as well, being very brusque in her manner of speech, but she hides a vulnerable side to her. Despite her skills as an assassin, she's never actually killed anyone before.

Her favorite food is curry and her least favorite one are prunes. She also sleeps an average of 4 hours per night.

Tokaku is normally shown wearing a white short-sleeved dress-shirt with a blue plaid necktie, a short plaid pleated skirt & knee-length light-brown lace-up boots.

Tokaku is skilled with using knives, whether it's throwing or fighting with them. She also has exceptionally quick reflexes, agility & speed. In addition, she uses a more direct means of assassins, although she hasn't actually killed anyone yet. Her physically & special capabilities are above average, & she has demonstrated an ability where she can know how an assassin smells & she is well aware of her surroundings.