Featuring piano arrangements of 21 BGM tracks from Aokana: Four Rhythms Across the Blue, in addition to a vocal arrangement of Contrail.

Includes True Colors ~Contrail~ (Vocal. KOTOKO).

Track List:
Piana Tracks (Song Title/Arranger)
1. Hajimari no Kaze/T･H
2. Ookina Sora no Shita de/Sakuma Kirara
3. Korogaru Konekosama/Sakuma Kirara
4. Zannenmunen/T･H
5. Hibi Kensou/T･H
6. Tsubasa no Kyuusoku/T･H
7. Shitou ni Saku Ichirin no Bara/T･H
8. Natsu no Yuugure/T･H
9. Chiisana Yakusoku/T･H
10. Kimi no Koe/T･H
11. Itoshii Jikan/T･H
12. Hisomu Kage/T･H
13. Tooi Hikari/T･H
14. Ashite he no Ippo/Ishihara Tsuyoshi
15. Contrail/Kishida Yuki
16. Isshinittai/T･H
17. Mugenkidou/T･H
18. Gyakufuu wo Koete/T･H
19. Ao no Kanata he/Kishida Yuki
20. Tadoritsuita Basho/T･H
21. INFINITE SKY Piano Arrangement/T･H
(Track 1-21 SOUND PRODUCED by SONO MAKERS)

Vocal Track
22. True Colors ~Contrail~/Vocals: KOTOKO
Lyrics: RUCCA
Composition: Mori Haruki (Elements Garden)
Arrangement: Fujinara Ryuutarou (Elements Garden)
Guitar/Bass: Fujinara Ryuutarou
Violin: Muroya Kouichirou
True Colors ~Contrail~ is not a piano arrangement.