Hoshizaki-san

A member of the Supernatural Phenomena Countermeasures Bureau. She is Sasaki's senior and also his boss. Although she wears heavy makeup, she is actually an active high school girl, and she does not wear makeup when going to school or in her private life, appearing as a plain, glasses-wearing girl.

She is a supernatural ability user who can manipulate liquids such as water. She can change the state of the controlled liquid, not only its shape but also from water to ice and vice versa. However, she can only manipulate existing water, not create it, and always carries a water bottle with her. Initially, she could not manipulate liquids if there were obstacles in the way, nor could she manipulate blood under the skin, but as her abilities grew, she became able to directly manipulate the body fluids of any living being she touched, even killing them.

During a battle with a supernatural assailant known as a "random attacker," she was in a pinch when Sasaki saved her with ice magic, leading her to mistakenly register Sasaki as a supernatural ability user in the Bureau.

She lives with her younger sister and, due to her family environment, has a strong attachment to money, actively seeking out missions that offer hazard pay. Initially, she saw Sasaki, who joined the Bureau as a supernatural ability user who could produce unlimited ice, as a convenient support member compatible with her abilities. However, after being saved by him multiple times, she gradually began to show a tsundere-like reaction.

The author originally planned to make her an adult woman, but later changed the setting to a high school student as she seemed to lack the composure appropriate for her age.