noto-sans-cjk-fonts package provides /etc/fonts/conf.d/59-noto-sans-cjk.conf.
It configures default font for sans, mono, and serif.

This configuration file shows the following file:

1. default font must be controlled by fonts-config package instead of
independent font package.
2. the configuration file assign Noto Sans font to Serif alias even though
openSUSE have serif-shape fonts for CJK language.

To resolve problem, I moved this configuration file to fonts-config package.
Moreover, add appropriate preference list for Serif font of CJK and Serif and
Mono for Japanese.
Note that as a conclusion of discussion, we continuously use IPA fonts instead
of Noto for Japanese.