Kazuki Miyaichi, a teenager, has always sensed a lack of affection from her mother because of the conditions of her birth. Struggling with feelings of anxiety and self-worthlessness, she turns to petty crime. Her life takes a turn when Eri, a new student from Yokohama, introduces her to Hiroshi Haruyama, a daring young man involved with the “Nights” motorcycle gang. As Kazuki becomes more attracted to Hiroshi, he rises to the position of leader within the Nights and finds himself embroiled in a feud with a competing gang.