That is a specific niche of Live2D animation fan-made repacks
Repacks take the raw game files (which can be bloated due to uncompressed 4K Live2D textures) and shrink them down without losing visual quality.
" appears to refer to a specific adult-oriented indie game or animation asset, likely involving elements of Japanese folklore (the miko or shrine maiden), supernatural themes (the cat/neko element), and erotic "tentacle" tropes.