He is an apprentice blacksmith and is in love with his childhood friend, the vampire, Luticia. However, when he proposes to her at the beginning of the anime, she turns him down due to their differences. He tells her he plans to improve his craft and propose again during the summer.
During this time, a vampire and a human woman began having an affair but out of fear of hurting her, the vampire breaks it off, which makes the woman kill him. This causes a lot of commotion between the humans and the vampires. By the time summer comes, Luticia accepts Shou's proposal and they have sex.