Top picture was from inspire’s femme fatale.
Bottom pictures was from Liar Soft’s ??? ??? !!! !!! ???
Alice Soft’s Daibanchou.
Hint time. Unfortunately, this is the only eroge the artist ever worked on, so I can’t give any hints based on that. However, one of the two scenario writers for this eroge is very very famous and prolific, and amongst other things, has worked on a few highly regarded titles that are different in theme, but share a common character archetype with this game.
Since no-one’s taken it yet, CRAFTWORK’s for elise.
Another image from an old game, but one with 100% less cynicism. 
This is Sakura and the image is from Toraha (Triangle Hearts, the first part of the trilogy to be more precise).
No… I’m not resurrecting this game.
I really don’t know where this character is from. Anyone recognize her? I’m interested in getting it, cause she falls into one of my fetishes. :o
SUPAH BUMP. Also I don’t know!
Also try guessing this one.
the EDEN Saishuu Sensou Shoujo Densetsu trial
also Narg’s image is from http://www.getchu.com/soft.phtml?id=129321
Try this:
Correct 
Can I get some hints on that one?
The game’s title is in English.
That doesn’t help much xD
Well since I don’t know the game of the image you posted I guess I’ll upload another image in the meantime.
To make things easier, here’s a normal image from the same eroge.
Hint time: Both games were released in 2003. The first one is a sequel. The second one is set in Akihabara.
Top image is from Baseson/NEXTON’s One2.
Bottom image is from Frontwing’s Shiritsu Akihabara Gakuen.
