Kanaka

カナカ

The artificial intelligence staff carried by Fumika is named Kanaka in the anime and Mayama in the light novels, with significant differences between the two versions. The staff's function is to assist the shigofumi mail carrier by tracking senders, receivers, and the delivery area, as well as supplementing other routine tasks. The mail carrier can input a numeral code to activate specific programs that provide further aid, such as rendering the staff invisible or generating white wings on its back to enable flight, although these programs have time limits. The staffs possess their own personalities and the ability to levitate. In the anime, Fumika's staff, Kanaka, has a female voice and a loud, boisterous personality that directly contrasts with Fumika's otherwise placid disposition. Kanaka often gives Fumika her opinion on matters regarding who she is delivering letters to, though Fumika simply continues her business as usual regardless. Despite technically not being alive, Kanaka insists that "she" be referred to as a person, or in terms of what a person would do; for instance, she refers to levitating as "standing" and regenerating as "sleeping." Kanaka is prone to making mistakes while on the job, such as misplacing letters.
In the light novels, the staff is called Mayama and has a young boy's voice, though it still serves the same function of supporting Fumika in her deliveries. "He" always talks down to Fumika and proves her wrong in certain situations. He has never been able to beat Fumika at shogi, though he can still do things she cannot, such as reading foreign languages.