The popular kid in class, Tokoi, has a way with people. Whether it's trouble at home, girls and their periods, a rumor that Ushiroda keeps cockroaches as pets, or Suzuki not saying a word at school, he manages to smooth over issues in a wonderful, friendly way. This book　depicts the last year of elementary school via the interactions between Tokoi and the serious girl who sits next to him, Koyomi. As the year and the interesting stories unfurl, you'll see Koyomi and the whole class change.