"Saki," "Eri" and "Mimori" are having a tea party.

The three friends are sitting on a picnic sheet in a small public park in Tokyo's Takadanobaba neighborhood, with a selection of cakes, quiches and pastries daintily arranged on plates in front of them.

Saki has black hair, while Eri's is blonde with a thick curl obscuring much of her face. Mimori has turquoise hair, the same shade as her eyebrows. All three are wearing light blue school blazers that mark them out — to those in the know, at least — as characters from the smartphone game Ensemble Stars!