The Detective Boys went to an eel warehouse's exhibit where there was a huge country fair at Genta's recommendation. Professor Agasa had asked them to bring some eels back to cook for them but, at the fair, Genta goes to the washroom and disappears. The Detective Boys search for him until they go to the loading deck and see Genta in a van gagged and attached by two mysterious kidnappers. They pursue on foot until they run into officer Yumi and Naeko's mini-patrol car and tell them to follow the truck since Genta is inside and has been kidnapped (thetvdb.com)