After dealing with the twin demons Maimai and Meimei, Kento enjoys the peaceful (ichaicha) days with Momo, Aoi and Yuzuha. Their class decided to run a Sengoku maid cafe for the school festival. However, Maimai and Meimei, who they thought were sealed, showed up during the break with revenge on their minds. They brought along the Maou and Momo and the other Djibril readied for battle. However, Maimai’s clumsiness and the Maou’s power caused everyone in the room to be brought to the Sengoku era…