MC's revenge plan isn't progressing very well if he already could have been killed by one of his targets. This makes me question if his Unit 731 grandpa, in fact, trained him at all. Senkouji was supposed to be one of his primary targets, unlike the nameless rapist, yet he was surprised like a deer caught in headlights. So what if Senkouji had a helper? MC has five primary targets to begin with, so did it never visit his mind he might, unexpectedly, need to deal with two of them at once? Only an utter fool would base all of the plans on the best case scenario when dealing with a life or death situation.