The strange world of Tsushima's stories

Yuko Tsushima's Territory of Light (1979, translated from the Japanese in 2018 by Harcourt) is a set of "linked stories," a genre just emerging at that time and now a little out of date (there was a time when every grad student in a writing program was working on "linked stories") that's unusual in several ways. The set of I think 12 stories constitute a narrative account (I'm only about halfway through the book) in the life of a young woman, mother of a 3-year-old girl, in the year or so following her separation from her husband. That in itself is not unusual - in fact, it's a major literary subset (from Sue Miller to Elena Ferrante, w/ many stops in between). YT's book is notable in that it's not a condemnation of an evil, selfish spouse; in fact, it's not clear (to me at least) who wanted to end the marriage - but husband does not seem abusive in any way and he seems to support the young woman in her search for a new apartment that she can afford. The two, as best I can make out, just seem to have become tired of each other; the man is now in a new relationship, but it does not appear that this was the cause of the breakup. The young woman on the surface seems competent and stable, holding down a decent job in an archive/library attached to a radio station (they don't have such things any longer) and, w/ some help from her mother and from a day-care center, taking good care of her daughter. The apartment they've found is appealing and pleasant - the top (4th) floor of an office building, with light from all four sides and a rooftop deck. But things start to go awry: a massive water leak, for which tenants blame the woman; a visit to a park that leads to an argument w/ her daughter, who runs off alone into the park and the mother can't locate he for what seems like hours!, the mother leaves the daughter alone, sound asleep, and heads off for a bar where she meets a woman her age and they proceed to get blindingly drunk and sick - and her husband finds her on the sidewalk, the mother has dreams or visions of falling from a height (and her daughter has been tossing origami papers from the rooftop) and then learns that a boy in the day-care center fell from the 10th floor of a building - and she thinks she actually heard him scream. And so forth - these are dreamlike elements, and we're not sure if they really occurred as such, which would be alarming in itself, or if they're part of the woman's dream or fantasy life, and thus troubling in another way - but all of this against a background of placidity and tempered emotions and the outward appearance of good mothering. It's a book of secrets, as she struggles to keep from others at work (she has few other friends) the break-up of the marriage and of the cost of keeping secrets.