The story is a parallel to games like Town of Salem, Mafia, and One Night Ultimate Werewolf. Each of the Vocaloid characters has a certain role they play that is invisible to the other “players” before their death (I.e. Kaito, the knight) and each following day the members of the town have to discuss who they think is murdering the other townies. Chaos and betrayal ensues!
I love this song. Schadenfreude is really fun to say LOL