Protagonist wakes up from a medically induced coma to treat his disease to find out men have nearly gone extinct. The population is crashing and needs to be, well, repopulated.

This is where the expected ecchi shenanigans ensue.

With that being said, this series also spends a lot of time on our guy trying to stay faithful to the woman he loves, who is seemingly missing and there's an emotionless lady who looks just like her waiting when he wakes up.

Mysteries? In my ecchi series? It's more likely than you think.