The story is about a humanoid named Shiroi "Houseki" Tsukiyama, who was freed from imprisonment. When he moved to Miyama, things got complicated because of discrimination and prejudice, including crimes between races: Ajentian, Humans and Hujentas. His exsistance of him being a rare race must remain secret, or it will cause an uproar and a threat to his life. His secret is in jeopardy when he moved to a school for Ajentians and Hujentas, including Pets. He then made friends. Will his identity remain secret, or will his life go back to how it used to be?