It is the middle of summer in Onomichi in the 1970s, and 22-year-old Akira returns home with Yoshioka, his senior at university. Akira offers his parents' house to Yoshioka, whom he likes, and suggests that they spend their summer vacation together. To keep the senior occupied, Akira comes up with the idea of inviting a girl to go out and play. He asks his childhood friend Fumie to find some girls who are bored, and Miko, who has a bit of an unusual personality, joins him, and the four of them start hanging out. Eventually, Yoshioka's eyes on Meeko grow hotter and hotter, which annoys Akira.