Episode 18: “To the World Tree”
- 18 of 25
- November 3, 2012
- 23 min
- Aired
Contents
| Series | Sword Art Online |
|---|---|
| Episode | 18 of 25 |
| Japanese | 世界樹へ |
| Original air date | November 3, 2012 |
| Episode length | 23 min |
| Studio | A-1 Pictures |
| Previous episode | Episode 17: “Captive Queen” |
| Next episode | Episode 19: “The Lugru Corridor” |
| Streaming | Crunchyroll, Netflix, Hulu |
“To the World Tree” is episode 18 of the anime Sword Art Online. It first aired on November 3, 2012.
Summary
The summary below describes what happens in this episode.
Suguha logs in as Lyfa and meets Kirito. They prepare to journey to the World Tree, during which Lyfa's old party members, led by Sigurd, confront her. Asuna learns Kirito is alive and observes her surroundings.
Characters in this episode
Music in this episode
- OP 2“INNOCENCE” — Eir AoiAnimeThemes
- ED 2“Overfly” — Luna HarunaAnimeThemes
Where to watch
Streaming services that list Sword Art Online. 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
All 25 episodes → · 22 of 25 episodes have a summary
About the series
This anime series is set in a virtual reality game where players are trapped and must survive. The story follows Kirito and his interactions with fellow players, including Asuna Yuuki, as they try to escape the game. What makes it distinctive is the high stakes, where death in the game means death in real life.
Read the article →References
- “Sword Art Online”. Kitsu. Retrieved October 22, 2026.
- “Sword Art Online”. MyAnimeList. Retrieved October 27, 2026.
- “Sword Art Online”. 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.