Sword saint in the the multiverse

A decently average man with a comfortable job at a tax firm gets transmigrated into the body of his Kensei Character from for honor and is sent into the multiverse with all the skills they would have, even a mythical sheath (cuz apparently only one character gets one)

Let us see how a 70 renown kensei deals with new and familiar worlds. (He will also have a katana and tanto because let’s be honest, it’s pretty unacceptable to see someone use the Japanese equivalent of a greatsword in enclosed rooms)