I'm Sorry, Mayuko Nise.Yuri and Mayuko decide to become allies. When Yuri contacts Rika to let him know what has happened, he orders her to kill Mayuko. Yuri wholeheartedly disagrees as her ally is more important than her safety. Rika says it was a test to gauge her tenacity. Afterwards, Rika discusses his beliefs that a Mask can never become a human again, and killing every Mask is necessary to survive. A flashback shows that Rika and Sniper Mask had a brief altercation...