Kaiketsu Furo Zukin (カイケツ風呂頭巾) is a one-shot Japanese comic book created and drawn by cartoonist Go Nagai. It was originally published in the magazine Weekly Morning published by Kodansha on 2014-11-27 (cover date #2014-12-11). It was published as part of the Premium Yomikiri Gekijo Regalo (プレミアム読み切り劇場REGALO). Features the infamous Satan no Ashi no Tsume (サタンの足の爪, the Toenail of the Satan) from Kekko Kamen.