Hitsugitan ist zu einem seelischen Wrack und zu einer außer Kontrolle geratene Kampfmaschine geworden. Arashi geht ein großes Risiko ein, um sie wieder zur Vernunft zu bringen. Er ist es ihr schuldig.
A Flashback on how Arashi was re-learning to walk and how Hitsugi helped him is shown. In the present Fiona directs Ampule 1 to capture Sayo, which confuses them, but Fiona explains that her illness has resurfaced and must be stopped. They runs across a berserk Sayo and proves to be too much to handle, but Miki and Yuko interfere in time. Yuko is willing to kill Hitsugi, since she promised herself that she would do it if it came to it once more. Arashi prevents her from killing Sayo and locks himself and Hitsugi in an underground part of the facility. When Mikoto tries to intervene, Masamune convinces her to let Arashi try, since they have survived the same illness. Yuko and Miki explain that 9 years ago they investigated a facility belonging to Itaru Togo, a member of the original team that researched the D99 virus, only to find everyone there including Togo dead, killed by a test subject. Miki found that the subject had developed a lot of strength and regeneration, but also deep psychological issues. Yuko was attacked by the subject, but right when she stabbed it, she realized it was Sayo. She saved her, but Sayo lost her memories. Arashi tries to make Hitsugi remember a promise they made each other years ago and finally succeeds when he takes off her mask. A grateful Sayo kisses Arashi in front of Mikoto, and then assures the rest of the team that she will no longer avoid her past. Meanwhile Kaname Makiishi, Syringe's leader, directs Kaoru and Kaori to kill a detective that's been researching them: Konomi Suzue.
Hitsugi s'est enfuie de sa chambre et représente un danger certain. Fiona ordonne aussitôt à Black Label de l'arrêter. L'équipe va alors se retrouver nez à nez avec une tout autre Hitsugi, pour le moins agressive, mais Arashi prendra courageusement sa défense.
Hitsugitan è diventato un relitto mentale e una macchina da combattimento in fuga. Arashi corre il grosso rischio di riportarla in sé. Glielo deve.
我を忘れ、暴走する柩。遂には仲間である『ブラックラベル』のメンバーにまで、その拳を向ける。柩を止めようとする嵐たち『ブラックラベル』。しかし、柩を傷つけたくないあまり、本気で戦うことができない。仲間が仲間を傷つける……そんな悲惨な現状の中、友子は遂に命の選択【トリアージ】をする。
――「お願いよ、小夜……！ もう二度と――あなたを殺させないで」
A doença de Hitsugi está em estado remissivo, e, fugindo do hospital, ela coloca não só a sua vida, mas a de todos na Tarja Preta em perigo!
Hitsugi está descontrolada, tras recibir una paliza que la dejó al borde de la muerte se ha recuperado pero ha perdido el control de su mente. Sus compañeras deciden ponerle fin hurgando en su pasado, mientras que el único que la comprende y sabe lo que hay que hacer es Arashi. Él lo tiene muy claro y promete hacer cualquier cosa por la persona que le ayudó a recuperarse tiempo atrás, pues ambos comparten una vida muy similar, y está dispuesto a poner su vida en juego por Hitsugi.
