A visual novel about Shiratori Ritsu, the sole male at Kirihara Academy for Girls and its priest, protects the school from demons but finds his sanity tested by the arrival of a new student, the one-hundred-year-old vampire Mary Harker, and a call from the devil, questioning his purpose in life.

• 4+ hours of story
• Full Japanese voice acting by seasoned professionals

November, the start of winter.Kirihara Academy for Girls, a missionary boarding school located in the remote Japanese mountains.It's here we find our protagonist, Shiratori Ritsu, the sole male allowed on campus and the school priest.Never once has he set foot outside the academy grounds, which protect him from demons lusting after him.But the girls of this academy come to him, believing he's their guardian angel, and he obliges.For he is burdened by the death of a girl, which strengthened his resolve to make others happy.This constant mix of the holy and the sinful has him just barely holding onto his sanity.And the sudden arrival of a new girl raises the curtain on a whole new story.For she is the one-hundred-year-old vampire, Mary Harker.However, her infiltration of the academy brings with it another surprise... Namely, a phone call from the devil.Can these powers of his truly bring joy to people's hearts? For what reason was he born?This is a tale of life, woven into prayer.

An extremely optimistic, extremely pure, and extremely clumsy vampire. The Red Bird.Still a novice for a vampire, she possesses little in the way of powers other than mesmerization.She's enrolled in the academy and is now the protagonist's classmate.Despite her tragic past, she remains a loveable airhead.The protagonist's "twin sister."Seems cool and aloof, but actually just can't be bothered most of the time. Has mysterious powers like the protagonist.She shows up at the academy one day and becomes his classmate.She'll say whatever comes to mind, often revealing her surprisingly lecherous side.A completely ordinary first-year student who's younger than the protagonist. The Black Bird.She's a masochist who truly comes alive when teased. Welcome home, MasterIs a member of the swimming club, where she practices the high dive.Though she's sensitive to danger, she doesn't let fear stop her in her tracks.A newly appointed teacher who previously studied at the academy.She tries to act as mature as possible in class, but has a habit of slipping up.Has known the protagonist from her days of skipping class, so she reveals her true self around him.The protagonist's classmate, as well as the smartest person at the academy. Has a perfect memory,Indifferent to how other people feel, her incredible genius often leads her to act in ways considered off-putting or unacceptable by many.She's taken a particular interest in the only man around, the protagonist.She's Risa's younger sister, and the two get along well.