Woman wearing a short skirt, leather jacket and black boots, chloroformed outside a nightclub it seems. Found by MoryoX.

Girl is chloroformed by a guy named Kuze. She doesn't seem to like the guy, I wonder why? Don't know what this manga is called. Please help identify it! Found by MoryoX.

Manga looks like it's in Korean. The girl is knocked out via a gas-mask like device. Please help identify this manga! Found by MoryoX

Two girls are gassed to sleep aboard some aircraft. They wake up on the ground. Please help identify this manga! Found by MoryoX.

Girl is chloroformed at an Information Center. A guy in a bunny suit seems to be involved. No idea what manga this is. Please help identify it. Found by MoryoX

A woman is given an injection in a car, which knocks her out. She is then kidnapped. Found by MoryoX.

Minako is being choked by an older man. She faints, but reawakens briefly when her lover comes to rescue her. She sleeps the rest of the chapter off.

A female undercover officer is given either too much alcohol, or a drugged drink.

Female police officer is tasered from behind. The last two panels are an unrelated unconscious scene I found.

Minako is kidnapped while walking on the street. She faints in the process. Did I mention she likes to sleep a lot for some reason?

A girl faints after bumping into a boy at school. The boy kind of goes crazy seeing the sleeping girl.

A pair of young girls pass out from too much alcohol. No drinking kids!!!

Some women are gassed in an Egyptian Museum. Found by MoryoX.

Two girls get into the back of a car, and subsequently get gassed. Found by MoryoX.

Minor head KO in the first few pages of volume 1. A big jerk knocks a young girl out, and tries to rip her swimsuit off!

This manga is about a girl who is really small. She's like the size of a doll. In this scene, she gets plucked off a ledge by a kitty. She's knocked unconscious in the process, and some animals try to eat her.

Yuki gets knocked out in a blast. Not a very good scene, since there's only two good panels.

There's like three KO's here. The woman wearing glasses seems to be a villain. She uses a tazer twice to knock out two different girls. After knocking out the second girl, the woman in glasses gets knocked out herself, via an injection to the neck.

Catgirl Himari is possessed by a demonic entity, and it renders the her unconscious. The boy, Yuto Amakawa, carries her away. Yuto is later seen carrying two cute girls (probably rescuing them). He crash lands onto the grass, and the girls momentarily faint. He ends up groping them by accident. Lots of fan service. ...

Girl on girl fight here. The protagonist uses a piece of clothing to suffocate her opponent. A little nipple slip here, but it's okay :-)