Moon, fire, water, wood, gold, the source of gold!

This is the lyrics of a Japanese military song.

Japan's week schedule starts from Monday, which are Japan Obsidian Day, Moon Obsidian Day, Fire Obsidian Day, Water Obsidian Day, Golden Obsidian Day and Earth Obsidian Day.

Moon, fire, water, wood and gold are 1 12345. . .

This means no rest days, no Saturday and Sunday.