Excellent chloroform scene here. A sexy looking school girl has a note in her hand, possibly to see her teacher after class. She goes to the lab where the teacher is.

The teacher appears out of nowhere and confronts the surprised girl. Suddenly from behind, another student chloroforms the girl! There's a panel showing a cabinet with a bottle of chloroform in it.

She passes out and is fondled by the two guys. Her hands are also tied.

Source: exhentai.org