Which episode does the Japanese state-owned railway police team take off their stockings to save people?

From: Episode 12, everyone is waiting for you.

Naoto and Iida asked the others to return to Tokyo first. After the two cleaned up the mess on the "Big Dipper" No. 3, they got off at Aomori Station. Naoto was very happy to learn that before arriving at Tokyo Station, the bus he was taking would be towed by an internal combustion engine locomotive KIHA381 equipped with a gas turbine engine. Naoto and Iida started their journey to Tokyo. However, soon after departure, a strange noise from the engine made him restless and he couldn't help but enter the cab. Later, it was discovered that the belt of the cooling fan of the train they were riding was broken. Naoyama Takayama and Nana Iida wanted to replace it with something made of cloth, thin, and flexible. When they were looking for it, they found that stockings could replace a section of the belt. It's time.

However, in the eleventh episode, stockings were also taken off

In the eleventh episode, I will accompany you

In the previous episode, Bell Prince Nina was riding their tram and was attacked by unknown people, and their plan was to kidnap Xiao Haiyuan and then lure Bernina out. Naoto Takayama thought of a way to pretend to be Prince Bernina, and Prince Bernina was escorted away by Nana Iida. Their plan went very smoothly. After rescuing Xiao Haiyuan, they found that the train was out of control, and the most important thing was that Naoto Takayama and Aoi Sakurai separated the first carriage, and they stayed in the first carriage. They took off their stockings while treating Sakurai Aoi, who had an injured ankle.

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