Mao, Vol. 13 (manga)

One of our friends confesses to setting the Goko clan treasure house on fire centuries ago. But why did they do it? Then, Mao has a revelation about Byoki the cat demon, the gang takes on a corrupt polluting industrialist, and Mei, the guardian of the Garden of Longevity, reveals new facets to her personality. Plus, a mysterious water wielder appears - whose side is he on?