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So, the next time you find yourself in a public restroom, and you hear a faint knock on the third stall... you might just wonder: is Hanako watching, waiting?
The character known as M Top (played by a veteran actor known for horror-adjacent roles) enters the girls' bathroom on the third floor. He deliberately knocks three times. He does not flinch. He calls out, "Hanako-san, I’m here." The stall door creaks open. Steam or fog rolls out.