The search query is interesting because it highlights a very specific frustration in the design and tech world: the struggle to obtain the "king" of Japanese fonts for use outside of a Mac environment.
: Use W9 strictly for primary headers. Its extreme weight (W9) is designed for "fine adjustments to the grayness on the page" and is best paired with lighter weights like W3 or W4 for body text to maintain readability. hiragino sans w9 install