AUTHOR: Ando, Natsumi (Story & Art)
Tsubasa and Arisa are twin sisters who have not seen each other for three years due to their parents divorce. They have communicated through letters, but finally decide to meet each other again. Arisa, the more gentle of the twins, suggests that Tsubasa take her place at school for a day, just for fun. However, there are things about Arisa and her school that she has not mentioned to Tsubasa--dangerous things.