This is the Lively Dandelion House ~Landlord's and Tenants' Rent War~ Unknown

Reality and Another World.
There, are the rampant tenants.
They had no money… It was painful, a really painful life.
Like that, penniless, traveling after escaping, really unlucky poor former slaves, and on top of that not educated refugees brother and sister-like Rin-kun and Silk are, at last, finding a job to ensure their meals.
That right, they found a job at the Dandelion House.
The job is manager of the rent collection.
Finally it began.
Hero, Devil King, Mangaka, Otaku, and Alien or even Monster. The powerful tenants and the adventure in another world fantasy.
Thus… The harsh rent collection war is now raising its curtain!