Mamono Hunter Yohko: Dai 7 no Keishou (魔物ハンター妖子 第7の警鐘,Mamono Hunter Yōko: Dai 7 no Keishō?, lit. "Devil Hunter Yohko: The Seventh Alarm") is an platformer video game developed by Klon and published by NCSMasaya on March 22, 1991 for the Sega Mega Drive in Japan only. It is the first game based on the manga and anime series Devil Hunter Yohko.