Secret Angel (1987)

A rather talented detective receives a strange request from a painter he knows. It was a request to meet a certain boy. The boy seems to belong to a certain organization shrouded in mystery. He begins an investigation to find out the true identity of Blue Boy Hajime, but it is quite difficult. On the contrary, the more he learns, the more something begins to change inside him...

Unfortunately the movie Secret Angel is not yet available on HBO Max.