All nine Valkyrie sisters attend the campus festival despite knowing the chance of an attack there is high, because they have the opportunity to all level up at once. The greater the risk, the greater the reward. Takuma is his usual insufferable scaredy-cat self, but that doesn’t stop him from ending up spilling viscous white liquid all over Yakumo or having to fish an eel out of Misa’s clothes—pretty standard lucky lecher stuff.
When the enemy (whom they don’t know is Garm) strikes, he robs the women of their source of power, the Einherjar by impaling him through the stomach and locking him in the bounded cube, while all the other festival attendees are converted to akuma minions that keep the sisters plenty busy. First sister Ichika and Natsuki protect the entrance, while inside Garm toys with Takuma, counting on him to do nothing and die as he enjoys a McDonalds banquet.
Things start to get dire as Itsuya and Mutsumi end up overwhelmed by akuma army and their various appendages, providing more ecchi content. But it’s Natsuki’s earnest belief that Takuma will indeed stand and fight when the time comes (because he’s done so and saved her many times before) that holds more power than all the T, A, and ahegao. Upon standing, Takuma is swiftly taken down by Garm, but Second sister Futaba finally locates them. He held out just long enough; now a Valkyrie has access to the Einherjar, and the tables can be turned.