Liminaut wrote:Hopefully ProfAllister will show up soon and make what I just wrote, like, coherent.
O.o So many expectations...
Actually, it's all there in the text - you just have to read between the lines.
Jigoro Hakamichi was a very different man from the one we seen in the VN when he first met Mayoi Suu Satou. He was an ordinary salaryman, strongly resembling a slightly older Hideaki. Mayoi was a doctor, moonlighting as an art critic. Shortly before the birth of their first child, Mayoi was struck by a pair of professional misfortunes: publishers suddenly stopped printing her art reviews, which were infamously scathing, due to rumors that she had driven at least one artist to suicide; and her medical license was revoked, after it came to light that she had taken to the sadistic practice of amputations on healthy infants. Reeling from that blow, she moved into the field of real estate development, where she did well for a time. However, it came to light that she had deliberately procured faulty wiring on the houses she built, which, along with the shoddy building materials of the rest of the construction, had a tendency to suddenly burst into towering infernos. She was cruel to her niece, often telling her brother that her genetic inferiority was a stain on the Satou honor, but the logical result of his careless miscegenation. When she learned of her daughter's deafness, and Jigoro's intent to learn sign language, she broke his hands, then, using her medical knowledge, set them to heal improperly, making it extremely difficult and painful for Jigoro to perform sign language. She later died in a car accident while driving drunk.
At least, that's what she wants people to believe. She faked her death to escape crippling gambling debts, as well as the shackles of an unfulfilling marriage. She now drifts through the Japanese underworlds, smuggling drugs, trafficking persons, and the occasional murder - for fun. After a particularly grisly killing spree, she decided to lay low by posing as a high school student, "Never Been Kissed"-style. During this undercover stint, she found herself charmed by one of the students, which led to a whirlwind romance. Finding herself in his bed, she realised that this would just further entangle her, so she injected him with a muscle relaxant before vanishing from the school and his life. It should have killed him, yet somehow the student managed to survive. Jigoro suspected this all along, and, ever since her death, he's trained himself relentlessly, and carries a katana at all times, so he'll be ready if she ever turns up again.
Two details about her stick in his memory like bright beacons - her penchant for group sex using sports paraphanelia; and the fact that she always wore sweatervests, in order to "stick it to the man."
Also, she made Misha a lesbian with the magic of the Satan-Jesus.
Or not, but you know, whatever.
Liminaut really hit the nail on the head - it doesn't necessarily matter
how Mayoi was written out of the story; what matters is that she is conspicuously absent from the interlude focusing on Shizune's home/family life. This is the basis of the most popular interpretation of Mayoi. Most people hate Jigoro (a position I disagree with, but not one entirely unjustified). As a result, they tend to rationalise that Mayoi must be the "good parent." Since it doesn't speak well to "the good parent" that she doesn't appear at all during her daughter's Summer Break, they rationalise that she must have been unable to show up - which usually means dead.
So, many people who've addressed the question assume that Mayoi was a saint and simply too pure for this cruel world. No explanation on why someone so beautiful and pure would marry a werewolf asshole who eats Satan and worships babies (and have 2 kids), but that's a minor detail.
In the end, Mayoi could be the source of all that is good in Shizune and the only reason she's survived her father. Or she could be so terrible that Jigoro actually IS the "good parent." Or maybe she's an international spy and is always traveling the globe, but always made a point of making it to Shizune's ballet recitals. Speculation and guesswork of what might and might not be possible is half the fun.