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Identity: It's a fanmade MSA anime and manhwa.
Background: In Tokyo, Japan, when the first protagonist named Shiori was born in 2002 in June 23rd in a rich and wealthy family, her future mother-in-law from a rich and wealthy family named Hisako was shocked by her beauty when Shiori's mother announced that she and Hisako's son named Hiromi are to be betrothed and have a happily ever after when they get married after finishing college in the future at 20 years old and said cheers to the lovely future couple. Hisako didn't understand why Shiori's mother seemed to always want them to get married so badly, because she's a fan of love stories? Is that somehow makes Shiori more exceptional? Hisako sadly couldn't bring herself to clap for them when all she wanted was Hiromi to marry Misaki who was just born just 5 years later then her younger twin sister Shiori was born that she worked for and planned for but Shiori's mother had other plans before Hisako could announce that Misaki and Hiromi are betrothed but Hiromi seems to like Shiori more because he feared that Misaki won't be an ideal Japanese woman that is a Yamato Nadeshiko like Shiori. Shiori's mother didn't understand why Hisako seemed to always want to talk about her 5-year-old older sister Misaki more than saying Shiori's name. So, after the ceremony was over, she told Shiori's mother, "No matter how much I hate to admit it but when I see him and Shiori all kinda together I get kinda...Worried when all i wanted him was to marry Misaki." and Shiori's mother was shocked, Hisako even claimed that Shiori cried everytime whenever she tried to hold her because she would cry and wriggle uncontrollably. Hisako didn't understand why Shiori seemed to always want to escape her. But then, doctors told Shiori's mother that the reason why she cried so much around Hisako was because Hisako had a brain tumor. What happens next?