Death note is a perfect manga of suspence and thriller. The story line is rich and tasteful and characters really standout from other manga and anime by the fact that they are so different. while reading Death note it will make you think and guess until the end. This manga is has dark themes because the main character basically goes on a killing spree for 6 years to create the perfect world and outsmart this foes.
About the story. The main character is Light Yagami who is a bored Highschool student, he soon finds a Death note which has the power to kill people by writing
there name in, he soon finds out about this power and a Death god call Ryku comes to Light. He decides to make the perfect world in which he is God. He starts killing criminals with the death note and soon becomes famous and known as Kira. We then see how the story unfolds and the intelligence of the main characters.
Just something I should point out, you will never guess what happens at the end.