Where can I watch The Case Study of Vanitas?

Dale is a well-known and highly skilled adventurer despite being so young. One day, he's on a quest and goes deep into the woods and finds a little devil girl named Latina, who is just skin and bones. Latina is branded with the mark of a sinner, but Dale decides he can't just leave Latina there and decides to become her guardian. Thinking to himself, "Latina is too cute, I don't want to work," he ends up doting over her before he even realizes it.

There is a certain restaurant in the first basement level of a multi-tenant building in one corner of a shopping street near the office district. The historical restaurant, marked by a sign with a picture of a cat, is called "Western Cuisine Nekoya." This restaurant looks completely normal through the week, but on Saturdays, it opens in secret exclusively to some very unique guests. During these hours, doors in various areas of a parallel world open to allow customers of many different races and cultures into the restaurant.