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신원: It's a fanmade MSA anime and manhwa.
배경: In Tokyo, Japan, a 14-year-old girl who is a middle schoolgirl named Natsuki was at home alone when suddenly she heard the doorbell rang and answered the door, It was a man named Naoshi who was just about to tell her her father got remarried and has two children, she told him, "Tell him i have nothing to do with him." To understand why she said this, we have to go back from when she was 9. Natsuki's father named Junichi divorced her mother named Sumiko and he left them and he was single, not even daring to start a new marriage now. Afterwards, this made Natsuki angry with him. By the time she entered middle school at the age of 11, her dad Junichi tried multiple times to call her on the phone and when she replied she told him, "Dad, i entered middle school. I can't come to your wedding with another woman named Kanako you're with. Please, understand, let's just go our separate ways." And hanged up, that was moment he broke down, all the sacrifices, all the things he did to divorce her mom Sumiko meant nothing. At the age of 14, that was the moment she told the man who rang the doorbell, "Tell him i have nothing to do with him." before he could tell her her father Junichi has two children with Kanako in that new life he deemed clean and hers filthy due to her being his legitimate biological child. This was because she and her father Junichi had a very strained relationship with each other. So that's why our relationship was so strained. So, she told Naoshi, "Tell him I'm gonna graduate middle school and I'll be in high school by 15." And he agreed as he left. What happens next?