The Riddle-alternate mix- Lyrics
| Song | The Riddle-alternate mix- |
| Artist | Ken Arai |
| Album | Kagi no Kakatta Heya O.S.T |
YouTube Results (More on YouTube)
| Song | The Riddle-alternate mix- |
| Artist | Ken Arai |
| Album | Kagi no Kakatta Heya O.S.T |