- Jan 24, 2022
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Rin is only maybe a year younger than the average of her classmates. Chika's one year older, that's why they're ~two years apart. (e.g. most of them are 19, Rin is 18, Chika is 20 (this game totally takes place in a college setting and all characters are 18+))Well, that returns some credence to the theory. I'm supposed to believe it's a coincidence Rin just happens to be that much unusually younger than the others in a class (or at least Chika)? I'd say it's more likely she, at the minimum, shares a mother with someone (Ami). Otherwise, that's quite the unused plot point.
For Rin to be Ami's younger sister, she would have to have been conceived around May the year after Ami was born to have the birthday we have for her and would be 18 months younger. Ami would have been at least two but more likely a lot older when Rin was adopted out. For neither of them to know about her existence would be possible but weird
If you take what Rika says about Rin's mother, it can't be Sekai, either. That information comes at least partially second-hand from the adoption agent, but should be somewhat reliable. If we do take that, Rin's mother was far younger than Sekai ("way too young to be having a kid") and had some sort of brain/head trauma or disorder. Her having any siblings also isn't brought up either (and her mother having another daughter ~12-18 months older probably would have had to give her up for adoption too,) and what we have points to Rin being an only child
