F1–F7 are not font names. They are PDF internal identifiers. To resolve missing fonts, you must identify the base font (e.g., "Ryumin-Light" or "KozGoPro-Medium") and download that.
CID (Character ID) fonts are a font format developed by Adobe to support large character sets, especially for CJK (Chinese, Japanese, Korean) and other languages requiring many glyphs. CID-keyed fonts separate character collection (CID) from glyph outlines and can be packaged in several font file types (Type 1/CFF, OpenType/CFF, TrueType-based). The terms "F1, F2, F3, … F7" are not standardized CID font family names; they commonly appear as internal or exported font names in PDFs, font subsets, or generated font files (for example when PDF authors or font-embedding tools rename fonts to short labels like F1). Those labels by themselves are ambiguous — they usually indicate a font resource index, not a published family. cid font f1 f2 f3 f4 f5 f6 f7 fonts better free download
GitHub releases of Sarasa Gothic (search “Sarasa Gothic releases”). F1–F7 are not font names
# Download all Noto CJK fonts wget https://github.com/googlefonts/noto-cjk/raw/main/Sans/OTF/Japanese/NotoSansCJKjp-Regular.otf wget https://github.com/googlefonts/noto-cjk/raw/main/Serif/OTF/Japanese/NotoSerifCJKjp-Regular.otf wget https://github.com/googlefonts/noto-cjk/raw/main/Sans/OTF/SimplifiedChinese/NotoSansCJKsc-Regular.otf # ... repeat for TC, HK, Korean. CID (Character ID) fonts are a font format