She is an Exorcist at the Kyoto Branch of the True Cross Order and Uwabami Houjou's daughter. Her sisters are Mamushi and Ao Houjou.

Raised by Father Fujimoto, a famous exorcist, Rin Okumura never knew his real father. One day a fateful argument with Father Fujimoto forces Rin to face a terrible truth—the blood of the demon lord Satan runs in Rin's veins! Rin swears to defeat Satan, but doing that means entering the mysterious True Cross Academy and becoming an exorcist himself. Can Rin fight demons and keep his infernal bloodline a secret? It won't be easy, especially when drawing his father's sword releases the demonic power within him!
 
(Source: Viz Media)
 
Note: Includes 3 extra chapters.

In the late Edo Period, a demon known as the Impure King killed thousands of people. After defeating the demon, the Knights of the True Cross kept its left eye safely sealed away on Academy grounds - but now someone has stolen it! Hearing the thief has taken a child hostage, Yukio and Rin go to help. The investigation and pursuit will lead Rin and his friends to Kyoto and involve them even deeper in a sinister plot! But will his friends' knowledge that Rin is the son of Satan drive a wedge between them? 

(Source: Viz Media)

Bundled with the 19th and 20th volumes of the Ao no Exorcist manga.

The first episode is based on the second chapter of the second Ao no Exorcist novel Home Sweet Home.

The second episode is based on the title chapter from the Ao no Exorcist: Spy Game novel

Nishiki Houjou