A young girl is chloroformed and taken away during a special forces raid of a facility.
The special forces had just finished filling the space with gas grenades (hence the one panel showing a guard falling asleep). No girls were KO'd during the gassing.
I don't know what happens to this particular girl. Maybe she was needed as part of some experiment.
Side note: This manga actually has a pretty sad and brutal story. It's violent and tragic. The world gets run over by a horrific virus that turns people into monsters. In order to control it, the government has to obliterate anyone who shows symptoms. Yes, I said obliterate. They have guns that vaporize people.
So you see women and children getting killed, siblings losing each other, kids losing their moms...oh god I wanted to cry. And I couldn't even read the text!
Sorry if I ruined the scene for you...