Update: 10-4-2009: I saw the manga at a store and took a look inside. It's a decent scene.
The art in particular is not very good. In the scene, Shigeta is chloroformed from behind by some person. We see her pass out in his arms (but we can't see her face). The perv even gropes her breast while chloroforming her.
In the next chapter, Shigeta wakes up bound with rope in the guy's house. The guy touches her inappropriately and stuff.