고등학생 삼신嵐(삼신嵐)은 첫 번째 악성종양 제거[범죄자 처형]를 마치고, 정식으로 불법조직 '블랙라벨'의 처형자가 된다. 그가 왜 악을 심판하는 처형자가 되었는지 ...... 그 진실은 9년 전 일어난 '국제의료회의 폭탄테러 사건'에 숨겨져 있었다. --한편, 임무를 수행하며 구출한 피해자가 또다시 납치되는 사건이 발생한다. '블랙라벨'은 피해자 구출을 위해 다시 한 번 어둠 속으로 뛰어든다........!

아라시가 다니는 고등학교 선배인 키바 미코토는 사실 '블랙라벨'에서 아라시와 함께 악과 싸우는 동료이기도 하다. --우연한 계기로 미코토는 미스터리한 전학생 히사키 치카게와 대화를 나누게 된다. 치카게의 성장 배경과 환경, 그리고 그 신념에 깊은 공감을 느낀 미코토와 치카게는 급속도로 가까워진다. 그런 가운데, 세상에는 살아있는 사람에게 불을 질러 불에 태워 죽이는 잔혹한 방화사건이 잇따르고 있었다.

Mikoto knows of the existence of a malignant tumor and rushes off alone to excise it, without waiting for the rest of Black Label. However, she runs across people taking a new narcotic, and someone else she didn't expect...

She can sing, dance, and act. A top idol, Nashida Oriha, is also a member of Black Label. She spends every day riding the world of evil. She's slated to help run a live broadcast celebrating a new TV studio, but things go wrong when the studio is targeted. How will Oriha get through this ordeal?

It's time for the show. Bad guys have hijacked the TV studio and taken the idols hostage. They've asked for a large some of money, and if they don't get they, they're going to force their hostages out of the 18th floor down to the ground below. Meanwhile, Oriha manages to slip away, and learns of their true intentions...

Sagiri Yuko, Tsurugi Miki, and Sayo Hitsugi, Ampule Zero, and Arashi, Mikoto, and Oriha, Ampule One, go to investigate a cargo ship that had arrived at Tobioka Port. Twins show up calling Hitsugi "senpai", but what is the true reason they want to pick a fight with her...

Hitsuji loses herself and goes on a rampage, and her friends, other members of Black Label, find themselves raising arms against her. However, Arashi can't bring himself to fight her for real, as he doesn't want to hurt her, but Yuko decides to execute the Triage...

Black Label rids the city of evil by severing the malignant tumors that have made their home there. Suzue Konomi, a detective, has looked into their organization, and finds herself kidnapped. Her assailants true objectives are a mystery, and more than just one group is after her. Will Black Label be able to sever the evil?

Black Label goes over the information they have thus far in order to figure out what's going on. It's clear there's a new malignant tumor out there. Just what does the Triage mean to Arashi and the others, and why have they chosen this way of life?