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Collection 15 (Knight Rosabell collection) is available after purchasing through the app. There are 5 songs in this collection. It features 5 songs from Chapter K of Cytus.
| Song | Artist | Easy | Normal | Hard | BPM |
|---|---|---|---|---|---|
| Lord of Crimson Rose | Eye DT feat. Searlait | 2 | 5 | 7 | 125 |
| Predawn | Nicode | 4 | 7 | 9 | 140 |
| The Fallen Bloom | Hoskey | 1 | 4 | 7 | 160 |
| Where You Are Not | Nicode | 3 | 7 | 9 | 180 |
| Music | Mai Aoyagi | 2 | 6 | 8 | 102 |