A Story Is Told

You found a box in your attic. It had a label on it [Letters- Atsushi Nakijima]. It looked old. Opening the box you see letters but they are mixed up but in a relative order. They wouldn't mind if you were to read these after all they're all dead now anyway.
You read them from the happy to the sad. But in the end A Story is Told.

These works are a series of letters that start with oldest first but they are slightly scrambled. There are some puzzles to be figured out but you can do that easily but better hope your not called down for dinner.

Warnings
-Suicide mentioning
-Major? Character death
-Angst
-Reminiscing on the past
-all characters are dead but letters
-Lots of death