Other means... the true person in that body he using will die

the og ryuu sanaria? yeah somewhat guessed as no way 2 soul could live in 1 body as a harmony if none of them paying the price, especially with those guiding skill.

For real! The yakuza old man knew the owner of that body still alive inside it was just sleepin... the og body had plus eyes more like star + khahahahhaha. Now the gurl attendant askin him who are ya?. ..

Forsure the og body dont know how to use guidin skill and she lettin the yakuza oldman use her body to save the world.