Nanatsu no Bitoku / Seven Heavenly Virtues (Fansevice anime)

This anime series is a spin-off of Sin: Nanatsu no Taizai.

For every evil there is always good. The actions of the Seven Deadly Sins are unforgivable. Heaven and its inhabitants decide to punish the demons corrupting the human world by sending seven archangels, each embodying one of the Heavenly Virtues: Michael, Uriel, Sariel, Sandalphon, Metatron, Raphael, and Gabriel. It would seem that a better team to fight demons could not be assembled, but all these angels turned out to be simply useless. Do they have a chance against the far more capable Seven Deadly Sins?