It’s only been three weeks since we started dating.

And yet, I was cheated on.

To make matters worse, the one she cheated with was my best friend.

When I finally gathered my courage to kiss her, she told me that it was ‘too soon’.

However, she just kissed him without a hint of hesitation.

Betrayed by the girl I’ve loved for so long, my childhood friend, and by my best friend, I was heartbroken.

At that moment, my best friend’s little sister appeared.

She held my hand as I was feeling down and said,

“I’ll become your cheating partner, Senpai♡ Let’s teach them the pain of being betrayed.”

Thus, my revenge began──!

However, as I spent more time with her, my lingering feelings for my childhood friend started to fade.

I was ready to put my revenge to an end, date her, and enjoy life.

But my childhood friend and best friend kept trying to reach out to me.

Our relationship became even more twisted.

Heading toward a point of no return…

Eventually, we revealed our true feelings to each other, and our relationship changed into something completely different from before.

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