Set to cover the inaugural run of the advanced Tokyo-Osaka-Nagaski Super Express train, Yuriko smuggles Ippei along as her photographer. Unfortunately, instead of camera equipment, Ippei grabs the wrong case from the office. Inside is a special compression unit containing an artificial like form ("M1") that was to be transported to an Osaka lab. The case is placed in a special safe in the engine car, but a news photographer's flash causes the sentient creature to expand, accidentally damaging the train's control systems.
新東京駅より初運転を始めた地底超特急いなずま号。順調な試運転と見えたが、一平が間違えて人工生命体を持ち込んでしまう。制御不能となった地底特急の運命や如何に！
