Lucia wears a maid's uniform as Kotarou requested, much to her embarrassment. Lucia and Chihaya apologize to each other, prompting Kotarou to suggest the club investigate some of Kazamatsuri's mysteries, but none of them end up as supernatural phenomena. Their next investigation involves uncovering a "rainbow utopia" in the woods, and Kotori brings along her extremely strong dog Chibi-Moth for protection. Deep in the woods, they discover a polluted portion of the river covered in rainbow sludge, killing off and causing birth defects in animals. Shocked by their discovery, the members prepare to leave...