Kikkai-kun - Vol. 1 Ch. 12 - Merciless! Cherry Blossom Viewing Hell

[MangaDex]

 

[NerimaShinjuku]

I’m surprised Japanese readers knew the story of George Washington and the cherry tree

 

[AndroidLB]

I’m surprised Japanese readers knew the story of George Washington and the cherry tree

Nagai for having grown up in American occupied Japan, it is not surprising for him to know it, but I don't know how well known the story would have been with the readers of the time.