Nagisa is a boy who was abandoned by his parents. When he was born the hospital took care of him until he was ready to live on his own. At age 5 he snuck out of the hospital and never came back. Nagisa is now 16 years old he became the top 1 assassin in the world and he was given a mission to kill a super monster that can move at mach 20.
What happens now?
Read to find out
The picture is not mine even the anime is not mine just so you know.
It will have a anime cross over so sorry if you don't want.