The story takes place in a fantasy world where "dreams" are the power. For the residents here, dreams are very important. However, a monster called "dream-eating beast" appeared. They feed on dreams and become the biggest and most deadly threat in this world. The heroine accidentally traveled to this world and became the hope of saving the world. She needs to wake up the sleeping princes and use their power to repel the monsters. Avi (voiced by Kenichi Suzumura), who is serious and cold on the outside but warm on the inside, Sinata (voiced by Ayumu Murase), who is simple, cute and sometimes a little willful, Baiye (voiced by Shotaro Morikubo), who is mature, stable and has a beautiful appearance, and Zi Yu (voiced by Soichiro Hoshi), who is very weak but unexpectedly strong, appeared one after another beside the heroine.