TL;DR: Kar 98 likes Negev, and at first things don't go so well, but they eventually get together and live happily ever after.

Synopsis: Kar 98 is the Warden of a concentration camp and she takes a liking to Negev.
She then tries to seduce Negev, but it doesn't work.
Kar 98 gets upset about it, then mildly tortures Negev and tries again.
She is more successful manipulating Negev into sex afterwards.
During sex, Kar feels that Negev is ruining the mood by being distant(?).
She then tells Negev to go back to her barracks.
At the barracks, it is found out that the other Jews are angry with Negev and end up trying to rape her(lmao makes sense).
While they're trying to rape her, Kar 98 and MP-40 bust through the doors and kill all of the prisoners that are trying to rape Negev.
Kar 98 then comforts Negev and takes her back to the Officers Quarters.
Negev then warms up to Kar 98.

After some stuff happens, Kar transfers Negev to a different cell block to protect her.
During the transfer the concentration camp gets liberated by Soviets.
We find out that in the fighting, Kar was wounded and got her arm blown off.
Negev finds her and saves her with advanced first aid.
Negev dresses up Kar 98 in Jewish prisoner clothing and tells the Soviets that she is also a Jew.
The Soviets let them both go, and it skips to them living in the U.S. seemingly happily ever after.

But there is a great plot twist on the last three pages, of which I won't spoil, just in case someone wants to read it.

I recommend reading it for yourself, it is an interesting read. And this is coming from someone who doesn't like Yuri hentai.