Shino  

, 志乃

Based on the information provided, it seems that Shino was a patient in a psychiatric hospital who suffered from self-harm and suicidal tendencies. She was manipulated by her doctor, Mukade, into joining a cult with strange rituals. Her family also became victims of his actions. Eventually, after being ruined, Shino took her own life. It is possible that Mukade encouraged her to commit suicide, as he had control over her mind. Additionally, Shino tried to persuade Rika Kawai, one of the other Wonder Egg Girls, to abandon the fight and die. Since she herself struggled with suicidal thoughts and self-harm, it may have been easier for Shino to try to eliminate Rika as a way to rid herself of her own pain. Despite being manipulated, Shino ultimately sided with her killers.