Manga no Tsukurikataまんがの作り方

This manga is about a girl who debuted as a mangaka at the age of 13, but no longer has any work as a mangaka at the age of 19. She decides to once again be a mangaka after reading manga by someone named Sachi and since girls love and boys love is currently popular she decides to go out with a girl coworker named Morishita who is in love with her to gain experience for her manga. However, she finds out that Morishita is Sachi! -Summary from Baka-Updates