峰静香和佐也香母女拜托毛利小五郎保护家中的宝刀，原因是怪盗基德发出预告，将要盗取宝刀据为己有。听到谈话的少年侦探团自然不会错过这个大好机会，他们跟随小五郎和小兰来到峰家。在这里，他们遇见了蛮横的老婆婆、天真的剑客铁刃以及自信满满的风雷藏，当然还有峰家的奇怪宠物们。小五郎听信了雷藏的话，放心大胆地和剑十郎开怀畅饮起来。 　　到了指定时间，基德潜入峰家，不过他这一次的行动可不轻松。先是遭到宠物秃鹫的撞击，接着又要连续使用美人计搞定峰家的女人们，而小小的铁刃也同样是个难缠的对手。另一方面，柯南偶然尝到峰家一种奇怪的药物，竟然发现它可以使自己变身，然而让他意想不到的事情发生了……

Mitsuhiko Tsuburaya lends Conan Edogawa a massive amount of manga, which Conan starts reading, despite the overwhelming quantity. Elsewhere, Kogorou Mouri is asked by the Mine family to protect the treasured sword in their dojo, as Kaitou Kid has sent a note of his intent to steal it. Upon arriving at the dojo, Conan and the others meet Yaiba Kurogane. Together, they aim to thwart the phantom thief's plans. However, Conan begins to notice something strange about the case...