Ryuugakuseiryou no Oshigoto

A 46-year-old man from the ice age generation retires early and manages an apartment building! However, it turns out to be a dormitory for international students! As he gets closer to the blonde Sarah with her dynamite body, he becomes the first man to be targeted as one of the 100 women in Japan to be slept with, but the man is a skilled craftsman at blaming...

(Source: Fanza, translated)

Note: Released at Comic Market 104, 105