Ok, she either just lost her fucking mind just now or realized something about herself or the teacher that’s hysterical. What the fuck is Minenami pulling now.
What Nagi is experiencing is known as
Paradoxical Laughter, often induced by trauma and mental disorders.
For example, for people with a history of abuse, being screamed at or being beat or even touched physically will cause periods of intense uncontrollable laughter or grinning.
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Unfortunately it is more common that people think, and for someone like Nagi, this is extremely unsurprising.
I'm glad the author is actually touching on how the strange ways pain and trauma affect people instead of just the existence of it.
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Please do some research of these subjects before you comment.