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X-Day is a Japanese manga series written and illustrated by Setona Mizushiro. It was serialized in Princess magazine from March to November 2002 and published in two tankōbon volumes by Akita Shoten. The story follows three high school students and a teacher who meet online and plot to blow up their school. Rika Saginuma, Nanaka Shimada, Yumihiko Tsukumura, and biology teacher Reiichi Katano meet in a chatroom, where they go by the screennames 11, Polaris, Mr. Money, and Jangalian, respectively.