The paper crane appears again

In a certain house, someone curiously muttered, "There seems to be a problem with the D-rank mission near Stronghold 61."

"What's the problem?" a shrill voice asked from close by. "What problems can there be for a D-rank mission?"

"In the past, these D-rank missions would be completed not long after they got assigned. Look, the average completion time is four hours, but the last two missions were only completed after a day."

"Eh? Is that true?" The other person went over. "Oh, it's really true. One took 21 hours, the other one took 23 hours. What's going on here? Are there no qualified account holders around Stronghold 61?"

"That can't be. There were a total of 11 qualified account holders who accepted both missions."

This meant 11 hitmen must have accepted the missions. But even with so many hitmen taking on the jobs, problems were still encountered.