A world where "gates" have been created and exchanges have begun with various different worlds around the globe. A variety of subhumans and monsters come from different worlds, but many of them have not decided on a home because of their individuality and characteristics. However, in a corner of Tokyo, there was a real estate agent specializing in different worlds who surely searched for the homes of such monsters. Real estate agent "Ebisuya". The owner, Gentaro, makes use of his background from a different world to find the best property for Ajin. From mermaids to undead, leave all the monsters living in Tokyo to "Ikuya"! !!