Mina Hazuki, a 15-year-old Pokémon Trainer from Pewter City, was reported missing by hotel staff in midtown Saffron City. Local police removed her belongings from her room and began searching for evidence of her whereabouts. The only item of note they discovered while clearing the room out was a small notebook. What follows are the final entries into Ms. Hazuki's personal diary.

After being sent to Fennel's lab by Professor Juniper on a special mission, Hilda, Bianca, and Amanita are reduced to an incredibly small size by a machine designed to reduce the sizes of objects for easy transportation while Fennel is out on an errand. Now, the girls must attempt to restore themselves, and the stakes only get higher once Fennel returns...