ECHO～チャリティ・デイズ～ (ECHO ~Charity Days~)

ECHO～チャリティ・デイズ～ (Echo ~Charity Days~) is a Hatsune Miku compilation album by KOTOBUKIYA that was released for a charity event. It consists of both new and old songs.

A crossfade of the album can be seen in Nico Nico Douga.

The album is purchasable on Amazon.