Chingochou Futsuryoukyoku Ukeika

Set in the near future, this is the story of a humanity being overrun by the forces of nature.
At the center of this phenomenon are "Dragons", mysterious entities possessing the power to return everything to the natural world.
Itsuki and Kayano are members of the Covenant Division, serving as mediators who interact with these Dragons through a ritual known as the "Covenant."

(Source: Comic Walker, translated)