Homo Kyura wa Hakketsu ga o-Suki: Zorome o Nerae (1986)

Population growth, food shortages ... Mankind is now on the verge of unprecedented danger. To avoid destruction, it is necessary to reduce the number of men. HOMO Cura No. 108 lands in Tokyo with his guardian Bocky. He starts his missions which revolve around looking for young guys with specific requirements and getting intimate with them to kill them. (Source: Chinese = Douban || Translation = MyDramaList)