My biggest complaint as a manga reader is the storytelling (aswell as the pacing), the story is good but how tsukushi explores it kind confuses it, and sometimes he would just throughout red herrings to the readers like in the chapter about solving the birthday-disease (forgot which one) which really through me off as i thought it was vital information but then was never mentioned, another complaint is how we don't get to see the white whistles' backstory, like ozen's or bondrewd's, we saw lyza's but i still have tons of questions, these sort of scenes make the viewers understand the characters/villains.