Enkou JK Bitch Gal: Ojisan to Namapako Seikatsu

The Japanese anime franchise "Life with an Ordinary Guy Who Reincarnated into a Total Fantasy Knockout" (異世界美少女受肉おじさんと, Isekai Bishoujo Juniku Ojisan to) originates from a manga series of the same name. The manga was written by Yu Tsurusaki and illustrated by Shin Ikezawa.