I Think I Turned My Childhood Friend into a Girl (Japanese: 恋する(おとめ)の作り方, Hepburn: Koisuru (Otome) no Tsukurikata, lit.

"How to Make a 'Girl' Fall in Love") is an otokonoko romantic comedy manga series by Azusa Banjo, published by Ichijinsha in Comic Pool and in collected tankōbon volumes.

It was originally released through Banjo's Twitter account starting on December 26, 2019, as Osananajimi (♂) o Onnanoko ni Shiteshimatta Hanashi,[a] and was picked up for serialization due to positive reader response.

I Think I Turned My Childhood Friend into a Girl is an otokonoko romantic comedy manga[1][2] that follows Kenshiro Mido, a young man with an interest in cosmetics,[1] who wants someone to practice applying make-up on other than his sisters.

[1] Hiura starts to enjoy presenting himself femininely, taking an interest in make-up and women's fashion and cross-dressing regularly; he also begins to find Kenshiro attractive.

[1][7] Banjo had originally considered self-publishing a print collection of the series but managed to get it picked up for serialization in Comic Pool, starting on February 21, 2020, due to strong positive response from her readers,[6][8] with the Twitter upload receiving over 120,000 likes by January 2020.