Thirteen-Year-Olds' Love and Sex

The protagonist of this story is an ordinary third-year junior high school student, Shuri. Her friend Yuka confides in Shuri that she might be pregnant. As Shuri gets closer to Yuka, she learns to take care of herself and love people. What kind of relationship should I have with my boyfriend? Why do I need contraception? What would happen if I got pregnant now? I want to ask someone, but I can't seem to find the courage... A love story woven by the hearts and bodies of junior high school students. (Source: Shogakukan, translated) *Note: Includes two extra chapters.*