A startling collaboration between Fumi Fumiko and cultural commentator Sayawaka.

Hana was blissfully enjoying the halcyon days of school life along with her friends, right up until the moment she received a mysterious letter emblazoned with the phrase "don't say a thing". Uncertain of its origins, Hana consults with her friends which sets off a disastrous chain of events - changing each of their lives for the worse.