

Episode 4: “That Undeliverable Letter...”
Aria the Animation · その 届かない手紙は...
- 4 of 13
- October 27, 2005
- 24 min
- Aired
From Acino, the anime encyclopedia
| Series | Aria the Animation |
|---|---|
| Episode | 4 of 13 |
| Japanese | その 届かない手紙は... |
| Original air date | October 27, 2005 |
| Episode length | 24 min |
| Studio | HAL Film Maker |
| Previous episode | Episode 3: “With That Transparent Young Girl...” |
| Next episode | Episode 5: “To That Island Which Shouldn't Exist...” |
| Streaming | Crunchyroll, Tubi |
“That Undeliverable Letter...” is episode 4 of the anime Aria the Animation. It first aired on October 27, 2005.
Summary
A summary of this episode has not been written yet.
Music in this episode
- OP 1“Undine” — Yui MakinoAnimeThemes
Where to watch
Streaming services that list Aria the Animation. What you can watch depends on your country. Acino does not host any video; each link leads to the service's own page.
Episode guide
About the series

Aria the AnimationTV series · 2005 · 13 episodes · HAL Film Maker · ★ 7.69
Aria the Animation is a 2005 Japanese anime television series based on the manga series by Kozue Amano. It is animated by HAL Film Maker. It aired from October 6, 2005 to December 29, 2005, with 13 episodes.
Read the article →References
- “Aria the Animation”. Kitsu. Retrieved October 22, 2026.
- “Aria the Animation”. MyAnimeList. Retrieved October 27, 2026.
- “Aria the Animation”. AnimeThemes. Retrieved October 23, 2026.
Episode titles and air dates come from Kitsu. The summary is written by Acino with AI assistance and checked so that it does not copy other sites.
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