An unexpected burglary into his apartment, which deprived him of the money to pay his rent, forces Toshio to live with the Kisugi sisters. On top of that, the culprit behind this deed, the notorious serial burglar "#107", robs the Kisugi house the very same night and makes off with their latest objective, the lithograph "The Firefly Woman", and a confessional recording made by Toshio for Hitomi as part of his loot. Cat's Eye and a determined Toshio quickly discover that #107 is Ai's latest admirer, a playboy and supplier of an underground auction market, and must catch him before some embarrassing secrets can be revealed.