Miki, a high school student born and raised in Kyoto, knows very little about how to have fun. Her classmate Aya seeks to change this, with the reluctant help of another classmate, Midori.

Midori meets George, a famous game designer from the USA. He gives her some harsh advice on the game she is making, which Miki interprets as a challenge.

The three girls visit a new board game café that opened up near their school. There, they meet Emilia, another board game fanatic around the same age as them, who moved to Kyoto recently from Germany.