Dead Dead Demon's Dededededestruction Koushou

Ouran and Kadode have newly enrolled in the university that Ai and Rin attend. They became friends with Futaba Takemoto and Makoto Tainuma at the university and decided to join the Occult Research Club, led by Senior Ōba.

Meanwhile, in Tokyo, invaders from space frequently appear, and the Self-Defense Forces are struggling to cope. The invaders' mothership looms in the sky, and a radical group called Aotama is actively hunting these invaders.

Amidst this, Ouran encounters the mysterious boy, Keita, again. As the world faces a crisis, we must watch how their destinies will change.