Korogari Ochite Ame to Muchi

Synopsis

Raised as the heir to the prestigious Ayamachi family, Ritsu believed that his future as a wealthy alpha was set in stone. He would graduate from high school, marry a prearranged partner, and follow the path his father had laid out for him. However, the teenager has never been good at school, and his lack of alpha perfection makes his father suspicious of him to try him again. When it is discovered that Ritsu is actually an omega, his disgruntled father is of no use to him anymore and expels him from the family in the cruellest way possible, by selling his son to a brothel and leading him into a life of sexual slavery.