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