Ami Nonomura is a brown-haired, green-eyed high school student whose story begins with a developing sexual relationship with her older stepbrother, Hiroshi. Their mother discovers this relationship and sends Hiroshi abroad to study in London. This separation plunges Ami into depression. During this low period, she is seduced by a playboy named Kōno at a nightclub. Her narrative weaves through multiple episodes, encompassing significant life events like marriage to another man and becoming a mother. Despite building this family life, the lingering shadow of her past with Hiroshi remains. Years later, a reunion with Hiroshi forces both to confront the enduring repercussions of their earlier actions and the complex emotional consequences of their relationship. Ami's development spans several installments within the franchise, tracing her journey from adolescence into adulthood. Her experiences navigate themes of forbidden relationships, familial conflict, and personal consequence, depicted across different life stages and challenges.