Kusari to Ai to Goraku o

Itsushi moves in with his boss Kouji after his mother marries Kouji's father. Kouji also has a younger brother, Shinji. On moving day, Kouji calls Itsushi to his room at night, then takes him to a secret room. There, Itsushi is raped and forced to become his pet. Will Itsushi ever find freedom, or will he surrender to his new life?