Kaoru, who had run away from home, is found and protected by her main teacher, Mirei, in the rain. At school, the teacher seemed like a responsible adult, but at home, her attitude is careless, drinking alcohol during the day and making jokes with a smile on her face. However, she accepts and understands the worries that Kaoru could not cope with.... Thus begins the faltering romance of two people who cannot yet become adults. An official manga adapting the visual novel "Uso kara Hajimaru Koi no Natsu" that was not shown in the main story, focusing on the relationship between a teacher and her student, portraying a love story, Youth ✕ Summer ✕ Yuri.