Nakadashi Haramase Shinyaku Chousa

*Drink, F*ck, Pregnancy Experiments Gone Awry*

A doctor (protagonist) is developing a fertility drug to
reverse the declining birth rate. At the same time, he's perfecting a
devious aphrodisiac. When these two get mixed up, it's sexual
pandemonium in the lab!

- Three HOT heroines (plus one extra!)
Hikari the nurse from childhood, Chiu with brother complex,
Mio the sensuous female doctor... who will he "experiment" with?

(Source: dlsite)