It appears that ImmersionKit, despite being Japanese-specific, does not prioritize Japanese fonts, so it uses Chinese glyph instead (on my Android).
The solution is roughly this, although you can use <html lang="ja"> as well.
It appears that ImmersionKit, despite being Japanese-specific, does not prioritize Japanese fonts, so it uses Chinese glyph instead (on my Android).
The solution is roughly this, although you can use <html lang="ja"> as well.