Kurikara

The Unbreakable Katana is a weapon that has been made indestructible by Unbreakable. It was first used by the Scarred Union Hunter before it was stolen by Andy made into his signature weapon.

Overview
The Unbreakable Katana is a katana with gold highlights and a black hilt. It is engraved with the kanji for "Unbreakable" at the cap of it's hilt.

History
It was created by Unbreakable at some point in the past. Later, the Scarred Union hunter obtained it for himself. After said hunter was defeated by Andy and Fuuko in Chapter 1, Andy took it for himself and has continued to use it since.