Yume To Utsutsu To Wasureji No Kimi summary:

Ryushin gets transferred back to his childhood hometown in Okinawa and is greeted at the airport by a tan and red-haired stranger named Jin. Claiming to be an Okinawan spirit called a "Kijimuna," Jin has been living in Ryushin's grandfather's home and looks exactly like the man who makes love to him in his dreams... While holding off the innocent spirit's affections, Ryushin discovers seemingly lost memories from his childhood. Can forbidden love exist between a human and an Okinawan spirit who awaits at the end of a trail of forgotten memories!