See the origins of Chainsaw Man mastermind Tatsuki Fujimoto! See the origins of the mad genius who created Chainsaw Man ! This short story manga collection features Tatsuki Fujimoto's earliest work. It's rough, it's raw, and it's pure Tatsuki Fujimoto! Killer mermaids, gender swapping, and a devilish little sister with the power to end the world. Four more unforgettable short stories that reveal the starting point of Tatsuki Fujimoto, the twisted mastermind behind Chainsaw Man.