You've gotten to know Issei Hyodo, a devil known as the "harem king". However, through a series of supernatural events explained later, our story is now focused on what could be considered his opposite, Makoto Fujiwara, an angel with no desire for a harem. However, fate begins to lead him on the same path as a dangerous goddess threatens the balance of Heaven and Hell.

20 years after the two entered the gate and never came back, their spirits live on as two pilots discover a new Strelizia deep underground as enemies both old and new emerge.

Foreign exchange student James Kozuki goes to Mitakihara from the US. He discovers there is more to this strange city than meets the eye.