S1.E1 ∙ Lend the Key to the Armor Shop

A young high school girl writes a love song to show a young man her feeling. The song is more than it seems as Yohko is magically transported to an alternate dimension while listening to the song.

Takeru meets the boy Jodis which is in trouble for theft. Takeru saves him shares the night with him, finding out that Jodis is a girl. Later she is been kidnapped and Takeru goes to rescue her.

Two mischievous cat-girls sneak away to their master's new bakery, becoming workers in the process.

In the near future, the demons prepare for a new assault on earth, which is protected by the guardians, a struggle that has gone on for eons. The dark masters have found ways to release the demon inside humans, and the first victim is Eiji, just at the moment he becomes engaged. He's hidden away in a brothel while the chief demon, Takamiya, assisted by an incestuous brother and sister, Huang and Chen, perfects the process. The earth's guardian, Tsunami, teams with Eiji's fiancée to set up a final confrontation. The earth's fate hangs in the balance.

The perpetually horny Ryohei begins working for an adult magazine when he has a chance encounter with an undercover reporter and seeks to prove to her that he's a competent lover.

The story of Oumae Kumiko and others as second-year students.