El bosque del piano Letter of Challenge (2018– ) Online
- Original Title :
- Letter of Challenge
- Genre :
- TV Episode / Animation / Adventure / Drama / Musical
- Year :
- 2018–
- Directror :
- Gaku Nakatani
- Cast :
- Tony Azzolino,Johnny Yong Bosch,Reba Buhr
- Writer :
- Megan Buchholz
- Type :
- TV Episode
- Time :
- 25min
- Rating :
- 6.8/10
An injured Takako travels to Oita with her teacher Shiba, who first noticed her at the competition five years before. There, she meets Kai again.
| Episode credited cast: | |||
 | Tony Azzolino | - | Igor (voice) |
 | Johnny Yong Bosch | - | Kai Ichinose (voice) |
 | Reba Buhr | - | Reiko Ichinose (voice) |
 | Griffin Burns | - | Shuhei Amamiya (voice) |
 | Lucien Dodge | - | Takako's Father (voice) |
 | Dorothy Elias-Fahn | - | Takako's Mother (voice) (as Dorothy Fahn) |
 | Doug Erholtz | - | Kinpira / Daigaku Kanehira (voice) |
 | Barbara Goodson | - | Shiraishi (voice) |
 | Todd Haberkorn | - | Ekieruto (voice) |
 | Erika Harlacher | - | Arisa / Sophie Ormesson (voice) |
 | Kyle McCarley | - | Sosuke Ajino (voice) |
 | Jason Palmer | - | Kosei Hirata (voice) |
| Zachary T. Rice | - | David (voice) |
 | Cindy Robinson | - | Nonomura (voice) |
 | Kaiji Tang | - | Takeshi Saga (voice) |