Ryo Saeba (aka the City Hunter), is a private detective in the city of Tokyo. Together with sidekick Kaori Makimura, Ryo is hired by actress Emi Makaze to find her long lost brother. The woman's brother turns out to be "The Professor", a dillusional ex-soldier who's planing to destroy the Shinjuku district of Tokyo. Kaori is assigned to guard Emi, but they both get caught up in the Professor's scheme. The City Hunter must save them, without allowing downtown Tokyo to be destroyed. 

(Source: ANN)

With many of its central personnel lost in the war, the Earth Federation Government is forced to rebuild, and Brian Midcrid, president of the Unified Colonies, takes the position of its president. During an emergency session of the Federation Diet, he publicly acknowledges the existence of extraterrestrials, and reveals the events of the L5 campaign to the masses in what will later come to be called the "Tokyo Declaration." He goes on to state that these aliens pose a serious threat to humanity. (Source: Crunchyroll)

Shidou Itsuka carries on with his quest for Ratatoskr in finding Spirits and trying to seal their powers, all while maintaining his relationships with the ones he had already sealed. Moreover, as new Spirits appear, he must undergo more complicated trials—all to put a stop to further disasters as he discovers more about the Spirits' origin. [Written by MAL Rewrite]

Extra short anime featuring Holo from BD volumes 1 and 2.