Shu enters his hideout for a quiet lunch only to find Inori, his #1 musical crush, bleeding on the floor. After he fails to stop her pursuers from hurting her more, his one shot at self-respect is to deliver a strange vial she stole to her terrorist pals.

Inori’s everywhere Shu goes for some reason, and it’s starting to fry his brain. But there’s no time to worry about it, because it turns out one of Shu’s classmates witnessed their terrorist action in Roppongi, and Gai’s put him in charge of the problem.

Gai sends Shu on a mission to Oshima, where he hopes to find "the rock that started it all." Shu's whole school club gets a free vacation as his cover, but using other people for his own ends still doesn't sit well with him.

Yahiro reappears with Jun, who's in Stage V Apocalypse disease and can no longer battle the cancer. With Gai out of town, Shu's left to make a command decision. But he AND the enemy are about to learn the virus doesn't work the way they think it does...

Shu's having horrible flashbacks, both to images of his battle with Jun and to other, even more upsetting images that soon have him quitting Funeral Parlor and alienating the people in his life.

GHQ is awash in blood, chaos and song. As the Cancer sweeps over Tokyo, Shu faces the truth about friendship and the consequences of inaction.