Sasaki gets the hang of his trading operation in the other world right about the time he gets in over his head in the modern world. He's (forcibly) recruited into a government agency for psychics, and his first job is right around the corner.
Why not simply make use of a grimoire, then?
لمَ لا تستخدم كتابًا سحريًا فحسب إذًا؟
Warum nutzt du denn dann
nicht einfach ein Grimoire?
Tu n’as qu’à utiliser un grimoire,
dans ce cas.
Allora perché non provi 
semplicemente a usare un grimorio?
Nesse caso, por que não
simplesmente usar um grimório?
Просто воспользуйся гримуаром.