TS pills!! A dream drug that switches your gender just by taking it!! Shota's friend Hajime teases him about not having a girlfriend recently. When he goes to Hajime's house after work and accepts his invitation, he finds a beautiful girl with huge breasts there, unfamiliar to him! Hajime and Shota who has transformed into a woman after taking the TS drug. Friday night, two tipsy people alone in a room... Naturally, that leads to────── This is a lighthearted gender change story where the TS girl starts out having sex purely out of curiosity but gradually loses her composure as the story progresses into the middle and end.