Shindou, Iroha

The student council president. She is frequently described as a superhuman due to her outstanding ability to concentrate and achieve whatever she wants. She is also a close friend of Yuuri Yanagi.

[Spoiler] She is the real player in the third round but ends it quickly by killing the five NPCs with her knife on the first day. [/Spoiler]

[Spoiler] Daiya recognizes her skills when using his box in Volume 5 and shares his Shadow of Sin and Punishment with her. Using this power, she tempts Hoshino into trying to kill her in front of Maria. After this, O explains to Hoshino that he has the power to destroy boxes and he tests out this power by destroying Shindou's Shadow of Sin and Punishment box. [/Spoiler]