If you need a portable bold Japanese font without licensing issues:

Often utilized in smartphone displays and web projects where strong visual hierarchy is required. Morisawa Inc. Licensing and Availability Hiragino Sans W9 | Fonts Specimen - Morisawa Inc.

But be careful — . Hiragino fonts are proprietary and licensed by Apple (and formerly by SCREEN / Dainippon Screen).

is the heaviest weight in the Hiragino Sans (also known as Hiragino Kaku Gothic) font family . Developed by Jiyukobo Ltd. and sold by SCREEN Graphic Solutions , this typeface is renowned for its "cool and contemporary" feel and its inclusion as a standard system font in Apple’s macOS and iOS . 2. Design Characteristics