I very rarely talk about manga (that's why I miss some of your events xD), so I dug into my memory looking for something that fits the topic of this mini-competition.
My choice is Kengan Ashura, which has about 236 chapters (I hope I'm within the range). I haven't read the whole thing, only the main part and the parts that interest me, but these are so good that it's worth reliving some of the less successful parts or ideas. As much as we like martial arts in the style of Tekken, but with blood, breaking bones, crushing testicles or eyeballs.
The plot is trivial, inspired by real events (this was not said in the comic), which are especially liked by the Japanese. They love watching life and death fights. Legendary MMA fighter Fedor Emilianenko attended 1 or 2 such events where he was almost choked to death. The main character is Okita Ohma, who represents one of the corporations during the great Kengan Ashura tournament. The goal of these Hunger Games is to determine the leader of all corporations in Japan. This competition involves companies that pretend they're not Sony, Bandai, Nintendo and more. Cool stuff for nerds. The opponents are different, as it is a Japanese comic book, the ones with crazy designs and very exaggerated skills dominate. However, just like in Keisuke Itakagi's manga, there are quite a lot of real threads here. Even though I don't like reading digital comics, I got so involved in the tournament that I had to read some of the fights that interested me the most. One of them is in my top-3 best fights I've seen in anime or manga and so far I've seen it 10 times. Next month during Christmas, I'll watch it again.