Okay, I should explain what a Vocaloid is. A vocaloid is basically a computer generated voice that can sing. It is becoming popular in Japan and it is like they project a 3D hologram of these cute anime like characters on a special projector and it sings and dances to live music. They have tours and concerts, which is crazy and amazing technological entertainment! It has a fan base.
Well, this is a fan video that is set in a feudal/sci fi Japan-esque world that has very touching music and the issues around a character named Kaito suffering mentally as a leader for the loss of his comrades. No singing or dancing or fighting of any kind. Pretty much similar to watching an anime drama. Oh! And I play Miku, which for this story, isn't as big of a role as a main vocaloid.