The story follows Walter, a half - pure - blood werewolf who can control his transformation. He lives in the Theocratic Diwei Holy Kingdom, where heterospecifics are mercilessly hunted. Walter, aiming to cross the Shates Wall and reach the Greenland Kingdom, stays at the Arthur family's house, posing as their nephew.
He tries to gather information to leave, such as observing Baron Kurtis' mansion. During a witch doctor's execution, a werewolf's attack reveals Friar Fula's powerful strength. Walter realizes that the chaos can be an opportunity to contact other heterospecifics, but he decides to wait until the Church's intense hunting subsides.
When he later explores the mansion again, he encounters a powerful werewolf, which forces him to flee. However, this encounter leads to a breakthrough in his perception.
To gain resources and information, Walter uses his painting talent to become an apprentice of Painter Alva in the South District Church with the help of Friar Ferra. The prior of the church tests him, but he manages to hide his true identity.
While at the church, Walter notices a suspicious worshiper who he suspects is a heterospecific. He follows the trail to the slum, where the strong stench makes his search difficult. Eventually, he finds a blood slave in a small wooden house near the forest. The blood slave, Adel, is in a frenzy for blood.
Walter enters the cellar and discovers a corpse and magic potions. He realizes the inhumane actions of the blood slave and takes a book from a hidden compartment. After leaving a warning note for Adel, he escapes and cleans himself in a river. The discovery of the blood slave makes him worry about the complex situation in Roya, especially the possible existence of a pure - blooded vampire.
