My Friend's Mother Ayaka Muto (2015)

Ayaka Muto is a beautiful and charming friend's mother, stuck in a situation where her husband is rarely home due to work. She finds herself developing feelings for someone else, leading to a taboo and forbidden relationship. This movie features Ayaka engaging in an affair, which can be categorized under the theme of a cheating wife or an older woman involved in an illicit romance, exploring the complexities of human desire and the consequences of one's actions.