A kind boy who always helps those in need,
Yoji is good-natured and has a strong sense of duty.
A passionate machining enthusiast with dexterous hands,
Kei is an outgoing yet somewhat naive girl.
The only daughter of the richest family in town, and Kei’s classmate.
Harbors a secret and strong sense of rivalry when it comes to Yoji and Kei’s adventures.※Appears in Episode 2
Butler for Kelly’s family. Takes care of Kelly,
whose parents aren’t often around because of work.
Worries about Kelly all day long.*A character since FASTENING DAYS 2
Anna, a widow, is a gentle woman
living in her family's house up on a hill.
She took in and raised Yoji and Kei, who are orphans.
Anna's husband left behind this robot bear
who understands human emotions.
He always looks out for Yoji, Kei and Anna.