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Identity: It's a fanmade MSA anime and manhwa.
Background: In Tokyo, Japan, in 2026, an 18-year-old young woman named Noriko who is a legitimate child from the Toriguchi family who recently graduated high school in May after just a few months, has given birth to two twin girls who are twin sisters named Hikari and Shiori in a natrual vaginal birth not long after she got married to her loved one who is a 24-year-old man named Minato from the Sugimoto family. It all started a few years ago back in 2008 before she was born when her late biological father named Hayato from the Hashiguchi family who is the legitimate son of the head of the Hashiguchi family was facing an amount of debt that was beyond his means just because his father's company failed, leading to bankruptcy. So, he was convinced that the only way to prevent it from happening was to actually marry his love rival from the Akimoto family named Takashi's girlfriend named Yukari from the Hishikawa family but Takashi did not believe Hayato at all for his plight. He didn't believe in two things, the fact that Yukari would give him more attention than him and also the existence of Hayato's father. But after Hayato got married to Yukari, she gave birth to his child Noriko who resembled her greatly in a natrual vaginal birth. Then, 4 years later, he died from bronchitis. Afterwards, her mom Yukari married Takashi and afterwards, he wanted a child of his own with her mom Yukari but wanted that kid to be his only kid and he definitely didn't want to be a stepfather. But now at 18 and moved on by getting married and has Hikari and Shiori in a natrual vaginal birth, she thought she was finally free but just then, the doorbell rang and it was Takashi. What happens next?