A horny highschooler boy dies after a train accident and finds himself in a room with people and a big black ball. Later on he gets in a "game" which he and others are missioned to kill aliens and whoever gains 100 points gets to resurrect. Gantz is a very misunderstandable manga. Well, it ain't a surprise since there are so much content of nudity and gore,but you absolutely mustn't judge it too quick. To be perfectly frank, I don't think it should be judged through its harsh contents. Gantz is my personally favorite manga. It didn't just give me a good reading time,but also it taught me a lot of things(u know moral values, psychologic message or meaning,etc.) Its certainly not an educational manga, but u get to learn a very important lesson by the end. I wont tell you that lesson,go read the manga yourselves and get the lesson. But the thing is main character (kei) he all starts as a sort of perv ( a horny kid dreaming of losing his virginity) and he also gets bullied a lot. As the story goes on Kei also develops mentally and the person he became at the very end in my opinion is one of the finest example to a character development in manga history. And also the readers get to improve and develop just like kei in overall. So it leaves a very big impact on reading community. The story is very creative and follows an unpredictable storyline( im telling u its just u literally cant figure out what the hell is gonna happen next) which makes each chapter exciting and fluent. There arent tons of dialogues,usually vital part is the drawings in chapters. So it makes it easy to read and move on chapter to chapter. The artwork is impressive at the beginning but it gets incredible as it goes on. Designs of the aliens are also very unique and well drawn. There are many scenes that require sex and violence throughout the whole manga but its not very disturbing in my opinion you may read it since you arent sensitive for this stuff. Gantz is a true masterpiece. Please dont mind the people who despise it. Read it. You wont regret in the end.