One summer day, the main character receives a letter from an unknown sender. The contents of the letter were to the effect that on this coming Saturday, we will dig up the time capsule that we buried during our fifth grade seaside school.
Overview：One summer day, the main character receives a letter from an unknown sender. The contents of the letter were to the effect that on this coming Saturday, we will dig up the time capsule that we buried during our fifth grade seaside school.
