The Night My Girlfriend Cheated On Me and Dumped Me, I Ended Up Going Out With a Nerd-Friendly Gal – I’m in Love With a Former Gal Who Turned Out to Be a Neat and Tidy Beauty Who Now Fits My Interests. Chapter Completed Discussion

This, like other works by the author, is pure revenge fantasy.

I won't bore you with the details of MC and Rika's relationship, because it's simply them falling more and more in love.

What's more interesting is how their enemies end up. Hint: MC is family of that one old powerful guy who appears in all three novels, so you can guess it's not all sunshine and rainbows for them. Ex-girlfriend:

Spoiler

After showing she's too s*upid to live for the entirety of the novel she goes too far and spreads a rumour Rika is pregnant. For that and previous transgressions old guy makes it so she becomes homeless.

She's still a minor, that would totally work in real life /s

But she goes deeper into her s*upidity and with the last of her money hires thugs to beat up/kidnap MC. Which works as perfectly as her other plans, and gets her written out of the family register and shipped off as a s*x s*ave to some small, exotic country.

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Classmates:

Spoiler

After helping spread the rumours classmates get expelled, and their parents get fired from their jobs. All of them. And they're told it's because of their children.

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Hired thugs

Spoiler

Sold off as organ donors.

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Like I said, revenge fantasy.