During their stay, the angel Hisui, and two demons, Koryuu and Kokuyo, also begin living in the house, along with the Koryuu's servants Ruri and Hari. Kokuyo is the son of Satan and is in love with Hisui, who is one of the four Angel Masters controlling the four elements: earth, wind, fire, and water; with wind being their element. Kokuyo admits that he made love to Hisui and that is how they ended up together. This relationship, however, is forbidden in both Heaven and Hell, so the two sought refuge on Earth. Kohaku originally came to Earth to find Hisui, who had been a mentor and parental figure to them. In spite his new housemates, Shuichiro remains as stoic as ever. Although he persists in not making a wish, without realizing it, he grows attached to Kohaku.