The evil magical girls finally make their move to seize the mana pool in room 106. Shizuka and the other girls will have to go all out to protect Corona House from strange new enemies, while Koutarou crosses paths with an old foe who's gotten a bit of an upgrade. The most intense battle yet, however, is the one going on inside Maki's head. Her job as Dark Navy now means making a move on Koutarou, but all she wants is to protect him. Does she uphold her mission, or does she follow her heart?