Here's a post talking extensively about this game. 

But in short, it was a visual novel made by a group of people/a French creator; I'm sure of that because one of the characters had several nicknames that only made sense in French. 

The game was kind of a comedy and wasn't taken seriously, and for a long time I thought I was hallucinating about it, but I managed to recover one of the images that I sent to my friend back then. 

I'm almost certain it was swept under the rug by Itch.io because it should have had an NSFW tag. 

Below is the only image I managed to save from this game; the protagonist is the one with brown hair, and his rival is the one with dark hair. 

Please help me at least find out the name of the game. I've been looking for this game for months and I just need to know the name so I can find out if I can download it elsewhere.