Onnagokoro@Danshi Koukousei

Ren Yoruno is an ordinary high school boy whose hobby is writing web novels. However, he finds that due to his lack of interactions with the opposite sex, he has no idea how to write female characters. That's when he finds an ad about a miracle drug that can make you understand the feelings of women. But when he drinks it...

(Source: Kadokawa, translated)