Killer!Sans, one of the most dangerous assassins in Tokyo, working for his boss Nightmare!Sans. same mafia. In particular, he performs his tasks alone, torturing his victims as much as possible. He torments his victims in cold blood with a devilish but charming smile. causing them to cry and beg for mercy. But basically, it's still the same teenager as many others, just with a perverted blood fantasy. With an object of adoration, he is very flirty...