Tenpou Ibun: Ayakashi Ayashi
English title: Ghost Slayers Ayashi
Japanese title: 天保異聞 妖奇士
Type: TV
Episodes: 25
Premiered: fall 2006
Source: Original
Genres: Supernatural
Studios: Bones
Producers: Aniplex, Mainichi Broadcasting System
Duration: 23 min per ep
Rating: R - 17+ (violence & profanity)

In the year of Tenpo 14, Yoi, monsters from another world attack Edo. Those who fight against them are members of Bansha Aratemesho. In public, Bansha Aratemsho is known as an organization to study foreign books. In fact, they are a organization dedicated to destroying the Yoi. These warriors are called Ayakashi. They gather information of odd events in the country, and are sent to destroy Yoi who appear. They are generally very strange people. For example, a guy who has lost his memory, a girl who dresses like a man. They have special powers with which to beat the Yoi.

(Source: AniDB)