The official soundtrack to Aokana: Four Rhythms Across the Blue Extra1! Features the theme song, One Small Step (Vocals: KOTOKO), and the ending theme, Happy Tomorrow (Vocals: Arisaka Mashiro), in addition to all 11 additional BGM tracks created for Aokana: Four Rhythms Across the Blue Extra1.

Guides
Aokana – Extra1 – How to Obtain Shitou-kuns, Shitou-kuns Everywhere Achievement
Secret Achievement Guide After completing the game, we have one achievement that is not unlocked. So we need to take: And fill the Sprite 13 Shitou-kuns: