hook code

Im relatively new in the world of MTL and I want to know how people find or create(?) Hook-codes for read untranslated visual novels, some of the old games I cant find the hook code on any forum and textractor dont hook automatically. The gods who posts that hook code first, how did they get it?

I'm using this game version come with fandisc and full appends https://vndb.org/r79858 I used Textractor , but the text i found with Kanji + katakana letters above them always missing (the other text with kanjis only are fine) Much thanks if anyone can help me