Kirikiri/krkrz is a very widespread visual novel engine. Unfortunately, most krkr games store script as imperative text, with different specific games having different specific parsers. There's no universal way to dump plaintext scripts from krkr games.
krkr games store assets in xp3 files. The easiest way to dump script files from xp3 files is with xp3viewer, or with arc_unpacker or GARbro. If those don't work, you need to find a hacker.