while no walkthrough is up to date to the current version you can find an archive of furukawa's here: https://adventurehigh.miraheze.org/wiki/Furukawa%27s_Walkthrough#
this (to my knowledge) is the most up to date guide on the game, but its still missing quite a bit of content, so i use the .50 version one and furukawa's in tandem.
i do hope changer makes an updated guide since (from what i know) nobody has been making guides for the game for a while now
even if theres no up to date on Discord there is a Walktrough on which you can find a Lot of Routes. (There are also a few who are above 0.50)
its in the "#Adventure High" Channel and you can find it by Filtering the Chat by Links.
Its a Folder which Contains .odt Dateien you can also open it with Word if your Connected with Wifi.