My Childhood Friend’s Girlfriend Was Stealed By The Protagonist. Well, I’ve Known This For A Long Time

This world was a sh*tty place. And I was a minor character who got his girlfriend cuckolded by the main character.

So, I didn’t go against the game, but moved as the game was set up, and finally the main character stealed my childhood friend’s girlfriend.

Now I can freely fall in love.

That’s what I thought.

But it seems that I have a problem with my ex-girlfriend …….

This is a story where I, a supporting character, surpassed the main character.