Kagerō.Since his family name was known to be born from an evil bloodline, Sōshi was secluded inside a shrine as a child. A year later at a party, a woman allows him to work for her in her house, where he is to serve a young Kagerō for a living. It is revealed that Kagerō told Sōshi to respond to the letters sent from his fiancée, to which Sōshi believed her to be very perceptive. When Kagerō showed Sōshi who his fiancée was, that being Ririchiyo, Sōshi was surprised to see a spoiled rich girl write letters so keenly. During the summer, they continued writing letters to each other, and Sōshi realized his feelings for Ririchiyo, but he started to feel guilty for faking Kagerō's personality. After hearing that Ririchiyo moved inside the Maison de Ayakashi, that is when he decided to become a Secret Service agent. Ririchiyo already knows that Kagerō was not the one who responded to her letters, but she is shocked to find out that Sōshi was actually the one who did, which confirmed how Sōshi knew so much about her in the first place.