Before Mio Takamiya appears, at the era of Mesopotamia, a spirit already appear on Earth in Babylon - it was the Spirit God, Ikki Nishizaka. He waited in the shadows until Mio Takamiya, several years later, appears. 30 years later, Ikki became teacher in Raizen High School to observe a certain boy which his adoptive sister was fell in love.
4 parts