Yamiiro No Aijin闇色の愛人; Dark Lover; Yami Iro no Aijin; Yami-iro no Aijin

From Yaoi Otaku Translation: Rei runs away from his uncle's home and, during the night, he meets a mysterious man that promises him they will meet again the next time there will be a full moon. However, the kid is taken by the police and sent to an orphanage asylum. 10 years later, he meets the mysterious man again...