I am unexpectedly really invested in this. I thought it was just another slave-fantasy ecchi that also happens to be an isekai but it's surprisingly endearing with a lot of action and a lot of cute and silly moments between characters. Kouji Mikagami, the usual "rarely-loses" gamer, is summoned from his world by an antagonist looking for someone with high-tier skills. Mikagami's skill is "Copy Skill" which is considered worthless due to it only temporarily copying his opponent's skills at half-strength and thus he is sold into slavery freely into a Slave Coliseum where he fights for his life as the loser becomes a slave for thewinner and is "bred".

The main draw of this manga is not only the ecchi situations and lewd designs of the women but also Mikagami's creativity in how he pulls victory from seemingly impossible battles. Then afterwards, almost like Rance (a Eroge protagonist), he basically bangs his usually sadistic opponents into playful submission where they then become his doting companions.

Believe it or not, there's much more action and silliness then there are lewd/ecchi scenes. If you're able to look past the initial cover art designs and art style, I genuinely recommend giving this a shot.