Endou

Endou is a classmate of Shino Asada who deliberately manipulates her way into Shino's trust in order to exploit her, first for a free place to stay overnight and later for money. After learning that Shino lived alone, Endou and two friends ingratiate themselves into her life, gradually taking over her apartment as an unofficial hangout, until inviting men over without permission finally forces Shino to call the police.

In retaliation, Endou digs into Shino's past and exposes the childhood shooting incident to the entire school, turning her into a source of ongoing blackmail. Manipulative, arrogant, and cruel, she has no hesitation about weaponizing Shino's gun phobia, at one point using a toy pistol to terrify her into begging for forgiveness in an alley — an assault interrupted only by Shinkawa Kyouji's timely intervention. Even after the Gun Gale Online incident becomes public, Endou continues to hound Shino for money, showing little sign of remorse for the harm she has caused.