I'm looking for a love triangle between two girls and a boy where one of the girls who was originally in love with the boy falls in love with the other girl.
The girls don't have to end up together.

The only thing that I could think of is Oddman 11 which is a supernatural, mature comedy. Basically if you're familiar with Scott Pilgrim vs the world. This is the female flip of that. A female mc challenges all the ex girlfriends of a boy she likes. But all the ex girlfriends start falling for her instead.

Quote from caozhi

The only thing that I could think of is Oddman 11 which is a supernatural, mature comedy. Basically if you're familiar with Scott Pilgrim vs the world. This is the female flip of that. A female mc challenges all the ex girlfriends of a boy she likes. But all the ex girlfriends start falling for her ...

Yup, It's a good read, but also kinda weird. Though all the exes don't like her like that.

She's doing all of this to be with the guy, but he's never around. When he is, he's always with his sister who he has an incestuous S&M relationship with. The main girl has had more development with the other exes. I wouldn't be surprised if she ended up with one of them. The catgirl, dirty girl, and nudist girl all seem to be in the runnings. Especially the catgirl who really likes her.

Blue (SAKISAKA Io) sorta has this.

The main girl is in love with her cousin. Well this new girl appears and the main girl thinks she likes her cousin. Well the new girl had a boyfriend who was cheating on her. Turns out she was using him because she's a lesbian and likes the main girl. Even though she rejected her, the main girl and new girl become best friends and the new girl helps the main girl get with her cousin.

It's by the same person who did Ao Haru Ride. Imagine Futaba and Kou liking each other, and Yuri liking Futaba instead of Kou.