Japanese literature> Reciprocal letter

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Japanese Literature
It's a letter, so it's a lie. It's a letter, so it's a sin you can forgive. It's a letter, so it's a confession.
The truth of the cruel incidents in the past is revealed in the exchange of letters.
It's a series of mystery in the form of a letter waiting for the shocking ending and the warm impression.
Please convince me that it was really an accident.
A wedding ceremony in the local area where broadcasting club classmates gathered for the first time in 10 years since high school graduation. Chiaki, who was missing only one out of four girls, is said to be missing.
There was a shadow of the 「 Accident 」 five years ago. (Collection of Graduation 」 10 Years after 「)
* Book edition