Shin Angyo Onshi
No, this isn't a plug for a Edited Manga group, but more of a thread to bring to light one of the best seinen manga out there right now. It's written and drawn by two Koreans, but made in the Japanese fashion, and actually released in Japan before Korea. In any case, it's the story of [insert copy/pasta]
"Long ago, in Jushin, special secret agents named "Angyo Onshi" wandered the country and restored the order. But now that Jushin is destroyed, only one is still wandering..."
Straight from the website, which can be found here
For more information, you can also find the wikipedia entry here
Basically, this is a manga for those who like plot twists, blood, clothes that are basically belts and only belts, and a very unpredictable plot. Unlike certain other ninja-esque manga that seems quite popular around here. Seriously, if you have a day or so to waste, download some of this stuff. It's good, it's gory, it's funny, and it makes other Seinen male main characters look like dorks sometimes.
[ayah]We have a Shin Angyo Onshi thread already. I'm merging this with that thread.[/ayah]