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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.

After their encounter, the three girls, Miki, Aya and Midori, have become fast friends. Excited to step into the new world of board games, Miki and Aya implore Midori to intoduce them to more games.

Miki, Aya and Midori gather at Aya's house to play board games. They are joined by Hana, Aya's sister, and Maki, Hana's friend. Miki feels like she has met Maki before somewhere, but can't quite remember.

Student council vice-chair Ren wants to bring Midori into the student council, but Midori declines, saying she has other priorities. Ren follows Midori to her workplace after school to find out what it is Midori is so passionate about.

Summer break has started, so Miki, Aya and Midori decide to go on a trip together. They visit Miki's aunt's inn in Kanazawa, and discover a classic Japanese game, GOITA.

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.

Maki finds Miki without anything to do, so they decide to hang out for the day. Meanwhile, as the school festival gets closer, students plan various events to spice up the festival.

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.

Emilia's dream is to become a game designer. She wants to discuss this with Midori, who shares the same dream, but Midori is afraid that she would be simply inferior to Emilia.

Aya's father Kenji comes home to Japan, just in time for Christmas. However, he seems to be more excited about his work than seeing his daughters.

George, the famous American professional game designer, invites Midori to submit his game to his company's game design competition. Midori, with the help of her friends, feels ready to take on the challenge.

Midori and Emilia discuss their ambitions and lay out detailed plans to achieve them. Aya is full of dreams and aspirations. Miki, however, just wants everything to stay the same.