Sunabōzu Odcinek 19: Up and Down

Due to Junko's arrest by the government, Kanta is in a state of depression. But, with the visit of the Chinoike artifact investigator Ikeda, he finds himself on another mission. This time it's to find the missing Natsuko, and he teams up with the Machine Gun brothers to take care of business. Ikeda takes them on a journey to a top-secret tunnel that holds many treasures, but his true reason for taking them there is still unclear.