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Ono Yasuomi is a cram school teacher with poor communication skills. He hopes to get married but doesn't know what "ordinary" means and feels awkward on dates with women. He asks Kasumi, a student who knows lots of trivia about romance, to teach him the meaning of "ordinary."

After his parent's divorce, Kazuo Saito moves with his mother from Onomichi and must leave his girlfriend behind. At his new school, Kazuo is surprised to reunite with his childhood friend Kazumi. "Remember I kissed you, saying I'll marry you when we're grown ups?" He feels embarrassed around Kazumi, who talks about their early childhood stories without any reserve. Kazumi has a boyfriend named Hiroshi Yamamoto. Kazuo is annoyed with Hiroshi's attitude, but with Kazumi, they naturally start to get comfortable with each other again just like old times. Kazumi's family runs a long-standing soba noodle restaurant. Her very lively, Japanese family consists of her parents, her grandfather, and a very young niece. She has one older brother who lives away in Tokyo. One day, Kazumi invites Kazuo to her house. After talking about old times, they walk to a place from their childhood called the "Lonely Watering Place". "Kazuo, the water here is very good. That's why our soba noodles also taste so good." Kazuni tries to scoop up some water with a dipper and the two accidentally fall into the water. They quickly crawl out, but suddenly realize that they have switched bodies! (In the following, Kazuo's mind inside Kazumi's body will be referred to as "KAZUO", and Kazumi's mind inside Kazuo's body will be referred to as "KAZUMI".) They go home, to the others family, who know nothing about the switch, but they seem rattled. Upset with the whole situation, the two both leave their homes. KAZUO says to sobbing KAZUMI, "For today, I'll have to play you and you'll have to play me."