Yume Oukoku to Nemureru 100-nin no Oujisama
English title: 100 Sleeping Princes and the Kingdom of Dreams
Japanese title: 夢王国と眠れる100人の王子様
Type: TV
Source: Game
Episodes: 12
Status: Finished Airing
Aired: Jul 5, 2018 to Sep 20, 2018
Broadcast: Thursdays at 22:30 (JST)
Duration: 23 min per ep
Rating: PG-13 - Teens 13 or older
Studios: Project No.9
Producers: dugout
Licensors: Sentai Filmworks
Genres: Adventure, Fantasy
Themes: Isekai, Reverse Harem

The heroine is a normal girl, until one day she is invited to another world and becomes the princess of the dream world, where people use dreams as the energy to live. One day, the dream world is being attacked by something called "yumekui" ("dream eater"), and many princes are being attacked by it. The heroine must wake them up to save the dream world, as the princes are unable to wake up due to having their dreams stolen.

(Source: MAL News)