The Snake Girl and the Silver-Haired Witch / Hebi musume to hakuhatsuma (1968)

Extremely fun Daiei adaptation of two Kazuo Umezu shojo horror manga into a single, crazily fx-laden story. Directed by Noriaki Yuasa, who directed all the classic Gamera films, & many ep's of Ultraman, Casshern, etc. - this has loads of classic, in-camera effects, double exposures, genuinely excellent makeup, and crude but effective wriggly beast props.