Takina Inoue, a secret agent who protects the security of Japan called a "Lycoris," is ordered to transfer to the café LycoReco in consequence of a certain incident. Takina is enthusiastic about returning to DA now that she's buddied up with the super-elite No. 1 Lycoris (?) Chisato, but her job at LycoReco is just one weird thing after another!?

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.