Level-5 has announced an official guidebook for Yo-Kai Watch 4 in Japan.
The guidebook is written in line with the Yo-Kai Watch 4 version 1.0.3 update. The 206 page book includes information on every scenario, Yo-Kai, map, and item in the game.
Yo-Kai Watch 4 official guidebook is scheduled to launch on August 23, 2019.
Pre-order here via Amazon Japan (ships worldwide).