Mashiro Ichijo is a girls' idol, handsome and kind, but he has been hiding a secret all his life; he's not truly male, nor entirely female.

The story ends with the real-world Mashiro and Sou Mizuhashi meeting by coincidence when catching the same train to school.

Additional information needed All of the main and secondary characters take part in the dream class at some point during the story.

When she began to develop it as a shōjo manga, she moved the setting to a high school, changing the sleeping pods the characters used for shared dreaming into canopied beds.

[28] The English edition of After School Nightmare was named by the Young Adult Library Services Association as among the 10 best graphic novels for teens for 2008.