May 7th, 2009: CEMA targets Kohinata Nanoka, the 'offspring' of Makie (female angel) and Zenzo (a human). Though Makie locked away her celestial powers to the point of being oblivious of her own origin and went into hiding - in hope to protect her children, CEMA nevertheless succeeded in abducting her son Shiro some years earlier. Camouflaged as a Persocon, augmentend with cybernetic implants, CEMA placed him and Miyahara Kuri (an undercover CEMA agent) into the Kohinata household in order to catch the angel.
For millennia angels have been watching over Earth and protected its inhabitants from evil creatures such as demons. However Makie neglected her duties as a celestial guardian for selfish reasons, allowing demons to dwell on earth...