Shinkoi-kun, a first-year high school student, is in the midst of adolescence. She ends up "dating" Yumomo Kawa, a famous girl in the same class, but...? A collection of short stories that you can enjoy from the world of Shungiku Uchida, including the title story "The Future of Happiness'' and "Summertime,'' which skillfully depicts the psychological state of a housewife with a certain "secret.''