This manga is about a jungle girl, who I think is based on Shanna the She-Devil (based on her name, Shanana).
In this scene, the jungle girl is chloroformed in her sleep by someone who needs a sample of her blood.

The first three panels are taken from Volume 1 actually, just to provide some background on the character. The chloro scene starts on page #4.

Contributed by: MoryoX
Keywords: manga, ecchi, jungle