Aomaki is a ninja residing in the mansion, specializing in water-related duties. He, along with Akamaki and Kiiromaki, mistakes the protagonist Himeno for a princess and assists her using his specialized skills. Aomaki possesses combination abilities that allow him to merge with other ninjas, forming new entities. Merging with Kiiromaki transforms them into Midorimaki. Similarly, combining with Akamaki transforms them into Murasakimaki. When a tornado threatens the mansion, Aomaki participates in collaborative efforts with the other ninjas to protect Himeno and her family.