**Height:** 132cm

A girl-shaped monster who can summon four water snakes from a different space on her back. Originally, she was supposed to be good at attacking from a distance using poison, but this has not been implemented. The girl is very scared and weak, but the four water snakes call her "Matsu" and love her as their sister.

(Source: Official website, translated)

Kuroitsu is an assistant researcher in the superhuman research & development department of Agastya, a villainous secret organization that battles with heroes who try to save the world. Kuroitsu lives a busy life in Agastya, caught between the absurd requests of her bosses; making presentations; implementing new features into superhumans; and getting results within the allotted time, budget, and spec requests; all without vacation.<br>
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(Source: Anime News Network)

The manga centers on the Kuroitsu, an assistant researcher in the superhuman research & development department of Agastya, a villainous secret organization that battles with heroes who try to save the world. Kuroitsu lives a busy life in Agastya, caught between the absurd requests of her bosses; making presentations; implementing new features into superhumans; and getting results within the allotted time, budget, and spec requests; all without vacation. 
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(Source: Anime News Network)

Hydra