For his next mission against Cat's Eye, Toshio has himself locked inside a near-impenetrable museum for two days to guard "The Mermaid" painting. Cat's Eye arrives to pull off the heist, but by springing a carefully prepared trap, Toshio catches Hitomi in her Cat's Eye costume. After Ai manages to knock him out, Cat's Eye must resort to every trick in their book to make Toshio believe that this encounter was just a hallucination.