This is a love comedy about a man who is good at picking up girls, Chihara Shion and Chihaya Rui. One day, Shion was drugged by a mysterious woman and found himself in a female body when he woke up. When Rui saw him, she started to pursue him without realizing that he was her friend... Hei Pi was drugged by a mysterious woman and turned into a girl. He can only regain his male body by having sex with men and obtaining Samen. However, if he loses too much Samen after regaining his male body, he will return to his female body. So Hei Pi's close friends have sex with both Hei Pi in female body and Hei Pi in male body. One thing that needs to be pointed out is that the first episode of this manga (I see that the distribution website also calls it the first volume, although it is very short) is completely a TL plot (that is, a whole chapter of intense sex scenes between men and women). In other words, if the animation is made into the latter part of the first episode, it is really heartbreaking to run naked in the TL animation under the name of BL animation without hanging a vest.