Koyama Yukari

Satsu, a young woman from a modest family, marries Kenta, a young man from a well-to-do and respected family. She settles in the family's home, where she meets the father, Keiichi, a strict man, Mihoko, the unfriendly sister-in-law and Akito, the elder brother. Although not everyone sees the union of Kenta and Satsu in a very good light, the father seems to have great plans for our heroine...

Housewife named Makoto Miki, an ordinary 30-year-old mother whose peaceful life suddenly changes when she learns of her husband’s affair. At this turning point in her life she's determined to reaffirm her own beauty, and decides to enter the world of fashion modeling. (from mangaupdates)

Hikaru is a firm believer in fate--always describing soul mates as two halves of one apple--and she dreams of the day she will meet her true love. One day Hikaru is reunited with a man, Shindou, whom she went to school with 10 years before, and believes fate has brought them back together. Natsuko, one of Hikaru's co-workers, refuses to lose to Hikaru in love, and pulls out all the stops in order to capture the man she desires. But who is the unsociable, austere stranger named Amano, and what part will he play in this exhilarating story of life and love? (NOTICE: This series has some adult situations, but I don't know that it is enough to classify it as "adult" or "mature" or "smut". The situations are few, and on a reasonably classy level.) (from mangaupdates)

Misaki and her ex-husband married for love. But it only lasted few years after Misaki collapsed and close to have a mental breakdown. In the eyes of her in laws, she failed as a wife and daughter in law; where was her husband when she needed his support most?….. Ryosuke spent most of his time and attention on his work. He thought his wife would appreciate his hard work; after-all, it was for the sake of supporting the family. But one day, his wife “suddenly”asked for a divorce… what went wrong? Kyoko was a housewife with low self-esteem. She was always physically and mentally bullied by her accountant husband, who would bring home his mistress even. Having been raised in a single-parent family, Kyoko thought she ought to stay put with her husband for the sake of her son…. but for how long before the last straw would eventually blow?

Six years have passed since she got married. Six years into her marriage, her work and child-rearing are smooth sailing with the understanding and cooperation of her kind husband. Yumiko was satisfied with her peaceful married life even though it was not exciting, but her heart was shaken by a sudden premonition of love.

Vintage romance from the bubbles years. Chronicles relationship marriage baby etc.

Can a relationship survive after an affair? Azu is 30-year-old stay at home mom and she runs a nail salon in her apartment. While carrying the frustration of thinking that her husband Junpei (32) doesn't love her as a woman anymore, she raises the child they were blessed with and continues through the motions of everyday life. One day, while Azu is running her salon, a customer asks to borrow her cellphone, and shows her something dangerously entrancing. A few days afterward, she receives a notification from an unknown man, sending Junpei and Azu's relationship into the deep-end… From Yukari Koyama of the TV drama "Rose-Colored Crusade" comes a challenging original work! You are invited to the story of 4 married people that could take place anywhere, filled with temptation, betrayal, and broken hearts– a true love story!