Summary: Rana-chan has been training to become a knight by killing captured goblins and farming EXP. She is given a set of Mirror Armor and sets out to slaughter wild goblins. Donning the set of armor which returns any magic thrown at it, she thinks herself to be invincible. However, to her surprise, countering possession magic with possession magic turns out not to be the best idea as the afflicted parties swap bodies. Goblin A and Rana-chan acquire each others memories though sexual intercourse. At the end, Rana-chan in Goblin A's body gets herself captured and is delivered to the new Rana-chan.
On page 37, you become able to understand goblin speech as well as see message boxes! It's the same story again, but you can actually follow the dialogue now.
@schoolchannel I dunno why you struck that last line when presumably you were explaining the plot to people who can't read Japanese either way.
As you said there, taking a page out of DATE's storytelling, they swap memories the more they have sex with each other. Rana (Goblin) was originally planning to leave with a partial memory swap, but Goblin (Rana) chases her down and ends up losing themselves completely, signified by their nameplates saying only Rana and Goblin at the end. Rana almost succumbs to the bloodlust/revulsion for goblins, but composes herself and leaves. At the end the guards say they captured a goblin wandering around their camp. Rana goes to talk to the goblin and realizes it's their original body and they came looking for them to have more sex. Rana sadistically agrees.
@Maea There's no spoiler tag, so I figured strikethrough was the best way to have a heads up and not spoil the ending without breaking the flow of the text.