Kanako Urashima (浦島 可奈子 Urashima Kanako) is Keitaro’s younger sister. Adopted into the Urashima Family when she was a child, Kanako never came to see Keitaro as a brother, growing to love him due to his understanding nature. When they promised to run an inn together when they grew up, she had assumed it would be as husband and wife.
In Keitaro’s absence, Kanako was sent by Hina Urashima to act as temporary manager of the Hinata Apartments while he studied abroad. Her black cat, Kuro, accompanies her wherever she goes.