Michael, also known in the series as Amamiya Shion, is "the popular boy." He makes top grades, is great at sports, and has a significant fan-base at the high school. He is the son of a preacher, is a Christian himself, and maintains the school chapel. His love interest is Miu Sakurai, though the feeling is not mutual.

Amamiya Shion is really the archangel Michael in disguise. Having foreseen Satan's coming, Michael had assumed the form of Amamiya in order to wait for him. He partners with the half-demon Seera for a while in order to force Satan back to hell and rescue Miu. But when Seera is too violent, to the point of killing Miu, Michael breaks off their alliance.

It is Michael who rescues Miu's soul from the clutches of Death. Michael erases Miu's memories and takes her to heaven to spend eternity with him. But Satan soon follows and a battle between Satan and the angels ensues. Miu regains her lost memories at the sight of Satan fighting for her and chooses to live with him. Michael, unable to deny the strength of their love, opens the portal that will allow Satan and Miu to return to hell.