The film follows four Japanese high school girls who engage in enjo kōsai, or compensated dating. This is a practice in Japan where older businessmen pay teenage girls more commonly to simply spend time with them, or rarely for prostitution. The movie is also a coming-of-age story. The main character, Hiromi, does not have the direction in life that her friends already have. Hiromi's friends were going to buy Hiromi a ring, but Hiromi refuses to take all the money because she does not want her friends to be jealous. Hiromi goes on dates by herself to get money for the ring. Soon, she gets in over her head. Hiromi falls too far into the world of enjo-kosai as she tries to hold onto a "friends forever" vision of the past.