The narrator introduces us to Hiroshi, a young man who has just graduated from high school. He's a good friend of Hiroshi's, and he tells us that Hiroshi is the kind of guy who likes to hang out with girls. Hiroshi tells the narrator that he's been reading a lot about a girl named Mami who's having an affair with a guy named Hiroyuki. Apparently Mami's mom has a lot of money, and she's using it to pay off her debts. The narrator is shocked that Mami is paying off her mom's debts, since he thought she was innocent.