A year has passed since Menma's ghostly return to the Super Peace Busters. Although the time they spent together during that summer was short, the five members reminisce about what happened as they each write a letter to their lost friend.
| Actor | Role |
|---|---|
 Miyu IrinoJinta "Jintan" Yadomi (voice) | Jinta "Jintan" Yadomi (voice) |
 Ai KayanoMeiko "Menma" Honma (voice) | Meiko "Menma" Honma (voice) |
 Haruka TomatsuNaruko "Anaru" Anjo (voice) | Naruko "Anaru" Anjo (voice) |
 Takahiro SakuraiAtsumu "Yukiatsu" Matsuyuki (voice) | Atsumu "Yukiatsu" Matsuyuki (voice) |
 Saori HayamiChiriko "Tsuruko" Tsurumi (voice) | Chiriko "Tsuruko" Tsurumi (voice) |
 Takayuki KondoTetsudo "Poppo" Hisakawa (voice) | Tetsudo "Poppo" Hisakawa (voice) |
 Mutsumi TamuraYoung Jintan (voice) | Young Jintan (voice) |
 Asami SetoYoung Yukiatsu (voice) | Young Yukiatsu (voice) |
 Aki ToyosakiYoung Poppo (voice) | Young Poppo (voice) |
 Mitsuru OgataAtsushi Yadomi (voice) | Atsushi Yadomi (voice) |
 Kaoru MizuharaSatoshi Honma (voice) | Satoshi Honma (voice) |
 Sayaka OharaTouko Yadami (voice) | Touko Yadami (voice) |
 Fuyuka OnoIrene Honma (voice) | Irene Honma (voice) |