Kamen Rider: 7 Riders Showdown

Kamen Rider: 7 Riders Showdown (仮面ライダー~決死戦7人ライダー) is a manga published in July of 1975 and was authored by Shotaro Ishinomori and drawn by Narui Toshiro. The manga was re-printed in 2001 and in 2012 by Kadokawa and Tokuma.

Story
Kamen Rider Stronger and Tackle team up with the 6 Kamen Riders to take down Black Satan, led by General Shadow. Shadow plans to animate seven famous monuments into giant warriors of destruction, such as the and. Can the Seven Riders put a stop to this evil scheme?