Did the Japanese pick up execution by crucifixion from the Portugese missionaries? It’s not as if they did not have any number of excruciatingly cruel methods themselves.
Hey, cultural appropriation and all that....
The Horrifying, Little-Known History of Japanese Crucifixion
https://www.ranker.com/list/history-of-japanese-crucifixion/melissa-sartore
I think it was a homegrown form of execution. Unlike Roman crucifixions, the victim was tied to the cross and stabbed with sharp bamboo stakes.