Aizawa Ayumu is a middle-school boy who does not attend school. He is currently spending his summer with his father in a rural town 2 hours away from Tokyo. His parents are divorced and this is the first time he will be seeing his father after a span of four years. Ayumu was initially reluctant to go but his mother offered him a mountain bike if he went. After having been in town for a few days, it seems that everything has been slightly odd lately. The flowers bloom out of season, strange lights appear in the sky and the people are acting in strange ways. Then one day, while riding his bicycle, Ayumu encounters a young boy named Wakkun who wants to play with him. Ayumu agrees but then finds the boy gone and a small spaceship flies into the sky.