西暦2236年

—April 1st, 2236 A.D.

—99 e-mails were unread.

—99 e-mails from the same sender… her.

This tale began five years earlier, in the spring of 2231. Mankind has evolved a new kind of communication ability called “telepathy.” Yotsuba notices a young girl who does not use telepathy in his first term. In the days that follow, she remains closed off.