Professor Eugene Levin, the “mu*derer,” is a genius whose well-intentioned research for the benefit of humanity was ultimately used to create weapons of mass destruction.

His last memory was of the disappointed gaze of his student, Kaizen Bernhard—who had become a rebel and come to execute him.

“I will never live like that again. I will quit my professorship and go to the Magic Tower!”

For some unknown reason, Eugene returns to the past—ten years ago. Determined to actively change the future, he boldly announces his intention to give up his professorship.

But somehow, contrary to expectations… quitting the professorship proves to be a difficult task?!

And then—

“You must have had fun while I was away, Eugene Levin.” “You, you…! Why are you here…!”

Kaizen Bernhard, whom Eugene thought had already graduated and disappeared, reappears. He hands Eugene a piece of paper with the university’s emblem printed on it in large letters.

“T-This is…”

It’s a certificate proving that Kaizen has become Eugene’s assistant—while still a graduate student.