Multiversal Store Master System

there is a store called the entertainment house, This place has as clients espers, heroes, supernatural beings and much more. what makes this store special is that all its customers are from another world. in this place there are rules, but the most important is do not cause problems for the owner or you will suffer the consequences. How did an ordinary young man manage to become the owner of this incredible store? And why is he so loved by his clients? read their adventures in this store. (the story is written in Spanish)