Tatsuki Fujimoto Before Chainsaw Man: 22-26

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.
(Source: Viz Media)

1. Ningyo Rhapsody (2014)
2. Me wo Sametara Onnanoko ni Natteita Yamai (2017)
3. Yogen no Nayuta (2015)
4. Imouto no Ane (2018)