Inside the Belly (S02E05)

In disguise, Suzukawa tries to buy Shiraishi's release from the 7th, but his plan is thwarted when Second Lt. Koito Otonoshi intervenes, resulting in Suzukawa's death. Meanwhile, Sugimoto, along with Asirpa, Ogata, and Shiraishi, makes a daring escape aboard an experimental hydrogen airship, but they are chased by Koito. The group successfully manages to toss Koito off the vessel and evade the 7th by navigating through the Daisetsuzan mountains.