These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Ninja Blade
Crowning Moment of Awesome: Tons of them, but the one that tops everything is when Ken Ogawa reaches a motorcycle while in mid-air, starts it and drives it on flying buses. Watch it here.
It could be argued that the entire game is made of this.
Fridge Logic: The game takes place in 2015, and the parasites were first encountered in 2011. If so, how could a man, who is clearly in his twentys and has lived a relatively normal life (for a ninja) have been genetically modified with toxic blood for the express purpose of being immune to something that had yet to be discovered at that time of his birth? Not to mention the fact that apparently his father also has toxic blood, and is in his fifties at least!