He is the known to be the youngest and most talented priest. He is also the Contracted Priest and lover (as the series talks about their past) of Itsuki Yamagami. Itsuki wanted a priest who is the strongest to make contract, so she can enter heaven faster - and the answer is him (a student who is roughly 19 years in age at that time.)    His specialty is archery. With that, he provides support to Itsuki when she is on the killing mode.

After being brutally murdered along with her family, Makina Hoshimura turns into a Shikabane Hime, a living corpse contracted to the Kougon Cult, in order to exert revenge on the mysterious undead organization responsible for her death. She is assisted in this task by Keisei Tagami, her contracted priest and former friend. This series follows the story of Keisei's younger brother Ouri, a boy with an unusual attraction to death, who slowly discovers his brother's secret and gets dragged into the world of the Shikabanes. 
(Source: Wikipedia, edited)

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A direct continuation of Shikabane Hime Aka, taking place six months after Tagami Keisei's death at the hands of the Shichisei (Seven Stars), a group of elite Shikabane who act on more than just regrets. As per Keisei's dying wish, Kagami Ouri formed a temporary contract with Makina to save her from degenerating into a Shikabane. Since then, Ouri's been training to become a proper monk so that he can remain contracted to Makina and help her fight against the Shichisei -- the ones who originally killed Makina, the entire Hoshimura family, and now Keisei. However, the traitorous monk Shishidou Akasha has sided with the Shichisei in an attempt to destroy all Shikabane Hime and the entire monk organization that uses them -- Kougon Sect.

Reanimated corpses called Shikabane walk the earth, but the Kougon Sect of the Grand Marshal School of Shingon Esoteric Buddhism has the means to combat them. Enter the Corpse Princesses! Undead-killers (usually young women) stand as humanity's first line of defense against the evil that lurks in the shadows, but can humanity tolerate defenders who are corpses themselves...?
 
One Corpse Princess, Makina, may be the first to find out!
 
(Source: Yen Press)

Takamasa Sougi