Koisuru (Otome) no Tsukurikata  

I Think I Turned My Childhood Friend Into a Girl, How to Make a "Girl" Fall in Love, Osananajimi (♂) wo Onnanoko ni Shiteshimatta Hanashi, I Turned My Childhood Friend (♂) Into a Girl, How to Make (a Otome) in Love, 恋する（おとめ）の作り方, 幼馴染（♂）を女の子にしてしまった話

Kenshirou Midou is a well-known student who conceals a secret: despite being male, he has always been fascinated by makeup artistry. Only his sisters and childhood friend Hiura Mihate know about this hidden passion of his. Apart from them, Hiura serves as Kenshirous only hope for realizing his potential in this field. One day, Kenshirou begs Hiura to let him practice applying makeup on him. When Hiura finally agrees, the dramatic transformation leaves Kenshirou stunned. From a plain-looking boy to an alluring girl, Hiuras new appearance stirs something within Kenshirou. On the other hand, Hiura has had feelings for Kenshirou long before his drastic change. Although she thought that a romantic relationship with him was unattainable, Hiura remains hopeful after learning about Kenshirous unusual hobby. As their bond deepens, the pair forms an unbreakable connection.

Koisuru (Otome) no Tsukurikata, originally released under the title Osananajimi (♂) wo Onnanoko ni Shiteshimatta Hanashi (幼馴染（♂）を女の子にしてしまった話), is a web manga released on the authors Twitter and pixiv accounts since December 26, 2019. Official serialization started in Comic POOL on February 21, 2020.The series has been published in English as I Think I Turned My Childhood Friend Into a Girl by Seven Seas Entertainment since June 7, 2022.