There's a fun sleepover taking place today! Everyone's having a blast practicing battling, playing games, and so on! ...But after everyone has gone to sleep, Lilie ends up sneaking out of the house... What could have happened?!
The Pokémon School classmates and Professor Burnet have come to Professor Kukui's house, and it's decided they'll have a sleepover! The fun hours race by quickly as they play games, practice battling, eat... but once night has fallen, Professor Burnet spots Lilie sneaking out of the house after everyone has gone to sleep. She tries following her, and finds Lilie staring out at the sea, looking lonely. Just what has happened...?