Toei Majokko Series

Little Witching Mischiefs is a crossover franchise made in 1999, including a video game made in February which included a unique introduction anime showing all 7 stars of their respective series interacting with one another. A set of 5 collectible figures were also produced in the franchise.

Plot
A merger of seven preceding magical girl anime series:
 * 1) Mahou Tsukai Sally from 1966
 * 2) Himitsu no Akko-chan from 1969
 * 3) Mahou Tsukai Chappy from 1972
 * 4) Cutie Honey from 1973
 * 5) Majokko Megu-chan from 1974
 * 6) Hana no Ko Lunlun from 1979
 * 7) Mahou Shoujo Lalabel from 1980

Other Sources

 * Intro video
 * Gameplay video