This world was a shitty game. And I was the side character who got cuckolded by the main character.
So I moved according to the setting, not against the game, and finally, the protagonist cuckolded my (childhood friend) girlfriend.
Now I could freely fall in love.
I thought.
But it seems that I have a problem with my ex-girlfriend …
This is the story of me, a supporting character, surpassing the protagonist.