Iron Mask Arrives (推参なり鐵假面 Suisannari Tekkamen) is the 19th episode of Concrete Revolutio and the 6th episode of the second cour.
A superhuman is discovered, still alive, in a block of ice. She is Koma, the legendary Iron Mask Fencer from the Sengoku period of Japan.
- Some of this episode's 17th century history comes from the expeditions of Abel Tasman, who did expeditions as part of the Dutch East India Company in 1642 and 1644. These expeditions led to the founding of Terra Australis (less commonly referred to as Magallanica), currently known as Australia.