I Was Reincarnated in Another World and Auctioned off as a Slave

Story :  There's no tragic hero here!!
This soft and fluffy yaoi manga is about a prince and a reincarnated man who becomes a slave.

Shuya Suwa (31) was on his way to a drinking party when he helped an old lady to cross the street and got hit by a truck. The next thing he knows, he's in a carriage with several young boys. When he asks where they were headed to, he is told the name of a country he's never heard before. And on top of that, they're all going to be put up on a slave auction!?

One would usually expect boys to be scared of the thought of being auctioned off in an unknown land... but something is strange here.
It turns out that it's normal for boys to choose to become slaves, as it means they can live a happy life in a rich household. In order to get the richest possible owner, the boys try to charm the men in various indecent ways, which makes Shuya just want to run away.
But, on his way out he meets a prince who didn't even want to attend the auction in the first place...