Battle Royale

about a group of teenagers killing each other by force. it's very dark and disturbing actually.

NHK ni Yokoso is a pretty good example for a hikkimori based manga. Well, okay, I'll take that back. In my opinion, the manga sucked, go with the novel 🤢 But yeah, deals with depression, pedophilia, drugs (to a minor degree), perversion, and overall hikkimori-ness.

The Liar Game!

• It's had amazing art; I absolutely love it.
• It super suspenseful. I almost had a heart attack.
• One of the main character is a genius, so it might remain you of Death Note
• It shows how evil people are in order to get money.

I love it.

[img]http://i30.tinypic.com/2u8uhlh.png[/img]
My destiny is to be forever free, in ecstasy on a hill that awaits for me.

Skyhigh - has bizarre sexual deviancy despite sexual repression and other darker parts of Japanese society. I felt the author was presenting them to make the reader think instead of glorifying something like some male-oriented fanservice manga.

I'd go with Kaji Ryuusuke no Gi. It's a political manga that I think shows politics in a realistic fashion. Some are good... Some are not. If you want a thorough explanation go here, because I can't say it any better then he does.

[color=green]"Officially, this machine doesn't exist, you didn't get it from me,
and I don't know you. Make sure it doesn't leave the building."[/color]