Koharu Uzuki is extremely shy and has spent her middle school days alone, unable to make friends. She dreams of youth and is determined to make it to high school, but she makes a huge mistake when she introduces herself. However, when Aoi Yuki, the most outgoing girl in the class, talks to her, things start to change for Koharu's high school life, which started with a huge mistake...? A story of love and friendship between four people with different personalities and castes!