E.C.H.O Lyrics
| Song | E.C.H.O |
| Artist | じーざす |
| Artist | 鏡音リン |
| Artist | 鏡音レン |
| Album | KING&KNIGHT -ワン☆オポ! BEST vol.01 |
YouTube Results (More on YouTube)
| Song | E.C.H.O |
| Artist | じーざす |
| Artist | 鏡音リン |
| Artist | 鏡音レン |
| Album | KING&KNIGHT -ワン☆オポ! BEST vol.01 |