Three Japanese authors that are wildly different from Murakami:
* Yukio Mishima. Prose is incredibly dense to the point of being baroque (there are pages of footnotes even in the Japanese originals), but there's nobody else quite like him: heavy focus on themes of sex, death and mysticism. "Temple of the Golden Pavilion" is his most famous work but the "Sea of Fertility" tetralogy is also good.
What I wanted was to die among strangers, untroubled, beneath a cloudless sky. And yet my desire differed from the sentiments of that ancient Greek who wanted to die under the brilliant sun. What I wanted was some natural, spontaneous suicide. I wanted a death like that of a fox, not yet well versed in cunning, that walks carelessly along a mountain path and is shot by a hunter because of its own stupidity…
https://en.wikipedia.org/wiki/Yukio_Mishima
* Osamu Dazai. The F. Scott Fitzgerald of Japan in time, themes and popularity, wrote a series of heavily autobiographical novels about his struggles with money, health, family and basically everything. Fairly grim but compelling reading.
The year before last I was expelled from my family and, reduced to poverty overnight, was left to wander the streets, begging help for various quarters, barely managing to stay alive from one day to the next, and just when I'd begun to think I might be able to support myself with my writing, I came down with a serious illness. Thanks to the compassion of others, I was able to rent a small house in Funabashi, Chiba, next to the muddy sea, and spent the summer there alone, convalescing. Though battling an illness that each and every night left my robe literally drenched with sweat, I had no choice but to press ahead with my work. The cold half pint of milk I drank each morning was the only thing that gave me a certain peculiar sense of the joy in life; my mental anguish and exhaustion were such that the oleanders blooming in one corner of the garden appeared to me merely flicking tongues of flame...
https://en.wikipedia.org/wiki/Osamu_Dazai
* Murakami Ryu. Not to be confused with his namesake, Ryu's writing is very opposite of whimsical and "Almost Transparent Blue" is shockingly brutal.
This was a factory, a sorting house. We were no different from dogs and pigs and cows: all of us were allowed to play when we were small, but then, just before reaching maturity, we were sorted and classified. Being a high school student was the first step toward becoming a domestic animal.
https://en.wikipedia.org/wiki/Ry%C5%AB_Murakami