Tetsu

A man came from the main island to investigate the demon that tells the future. Being an old friend of Nagi's husband, he also has a bit of knowledge about the demons.
Tetsu prepared a variety of materials and tools for the purpose of challenging the demon himself, but Kyouko, who provided him accommodation, found out that they are all useless afterward.
A gentle and strong man, dislike being called "old man". He also helped out as an engineer during his time in Haikyo.