Battle Royale

I recently started reading a manga called Battle Royale, which is quite interesting. However, it's not some funny, happy manga like Sket Dance. This one is more of some thriller, with lots of gore and blood. Basically, in a corrupted Japan, a class of students would be kidnapped and placed on an island. "Kill or be killed". Last one standing would walk home free. It sounds like your typical plot but the manga is really, really intense. Not for the faint-hearted.

In fact, there is also a live movie of it, although I do not intend to watch it. Seeing all the gore in manga is quite bad already; I doubt I can take it in real life.