[Reborn!] Hey, Long Time No See

"Hey, you've saved me a few times now, right?"

"Come to think of it, I don't really have anything to thank you with..."

"Oh, I know. How about I give myself to you, Tsuna-kun?"

Set in a parallel world. Reverse transmigration.

The old-fashioned hero-saves-the-beauty trope. That's it.

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