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Identity: It's a fanmade MSA anime and manhwa.
Background: In Tokyo, Japan, a mother named Akiko and a father named Daiji from the Hashimori family had always wanted a son, but it seemed like everything they wished for only came with the first protagonist who is a girl named Yukari. But by the time Yukari was 15, her mother Akiko was pregnant for the second time and the baby was a boy named Minato and she gave birth to him in the same natrual vaginal birth as Yukari. So, they thought she was finally happy, but instead, she lunged forward and lashed out, saying, "I said no! That is not mine!" And she punched her dad Daiji in the chin with such force he fell down on the floor. Her mother Akiko and father Daiji didn't understand why they have seem to lash out at them like that and it's been happening for days the moment she discovered their true desires. But what they didn't know yet was that she wasn't angry, she was unsettled. What happens next?