SLAY do two things and they do them well: They play killer music and they slay killer demons.

After Milly's rescued from mortal danger by the hottest band on the planet, she hardly expects to join them... But now she's headed to Tokyo, ready to track down a hellraising demon. And when SLAY are invited on tour with a super-cool band of holographic girls, it's Milly's turn to step into the spotlight.

Except strange things start happening on the SLAY tour train. Suddenly it seems it's not just SLAY's fans following their every move, but something very, very evil. Play time is over... Now it's SLAY time.