Set in the fantasy world of Material Puzzle, a manga done by the same author, Berji, Shuga, and Chrim live peacefully on a sparsely populated island. Berji and Shuga have unique talents that allow them to tame animals called Deathleon. On one peaceful day, an uninvited large ship arrives at their island. The ship belongs to the "Ironclad Giant" Suppression Team, and with them, they brought a piece of an Ironclad Giant. What this ship and its crew brings to the inhabitants of the island may change the world forever.