Gokusai No Ie summary:

In a certain place, there lies a house where children with vibrant hair colors are raised in dedication to God. A cormorant with jet-black hair appears to have the finest color there.Deep in the mountains, there was a temple flooded with colours. Children with beautiful hair colours had lived there from a very young age. After living his whole life outside, a black-haired teenager, the rarest hair colour in the country, started to live in the temple. Unaccustomed to traditions and their culture, how will he spend his new life?