An outbreak of serial attacks against Lycoris occur. In order to stay in groups, Takina decides to stay over at Chisato's house. But for these two, living with someone for the first time is full of unpredictable situations!? Meanwhile, Kurumi secretly searches through the information DA is holding and gets close to the surprising truths about the assaults on Lycoris.

Chisato is dragged into a tough fight against Majima at the old radio tower, but Takina rushes in just in the nick of time. Meanwhile, the existence of the Lycoris is exposed to the public due to Majima's ploy. At Headquarters, Kusunoki's command is stripped, and a decision is made to dispose of the Lycoris inside the Enkuboku!?

All is settled with the incident at Enkuboku—or so it seems until Majima, who should have been defeated at the old Radio Tower, reappears before Chisato. Majima planted a bomb in the Enkuboku, betting on the explosion when he challenges Chisato to a one-on-one fight. As Chisato's own time limit approaches, the final battle begins!