You were on a mission alone to defeat a low ranked demon, but you stumbled across a group of demons making fun of the blue one, he seemed quite upset, but as you looked closer, you noticed that they were the upper fours. The tearful demon could be on an act to lure you in so you stayed cautious

4 hours later you finally found the demon and finally killed him

As you returned the same path you crossed with caution, as you get closer to your home near a river, you found the blue demon sobbing over the river