Name: Jinno Umi
Gender: Female
Age: Second-year high school student
Height: 165 cm
Appearance: Black hair, short cut, blue eyes, almost sickly pale skin
IQ: Unmeasurable
First-person pronoun: Watashi
Second-person pronouns: Kimi, ~(surname)-kun/san
Likes/Skills: Studying, secret account activities
Dislikes/Weaknesses: Exercise, communication
Public (school) persona: After entering high school as the top student, she has remained first in her grade forever. She is also among the top nationwide. However, she is not exactly an honor student; because she is a true genius, she never studies at all, and her athletic and communication skills are below average. A cool-type beauty. A lone wolf who always acts alone, basically never initiates conversation, and is passive in everything. Sharp-tongued and foul-mouthed, she quickly hurls insults. Zero romantic experience; even when confessed to, she just says something like "Oh, okay" and rejects them.
Hidden persona: Active on an extreme secret account. Her posts include risqué selfies (with her eyes hidden), audio clips, song covers, complaints, and more. She is addicted to the sense of guilt that her life would be over if she were exposed. She also lives alone (for no particular reason). Her daily routine has completely collapsed.