Dragon Ball Heroes: Victory Mission

Dragon Ball Heroes: Victory Mission (ドラゴンボール ヒーローズ ビクトリーミッション) is a spin-off manga created by Toyotarō, and based on the arcade game Dragon Ball Heroes.

Seven Evil Dragons (Chapter 15, Volume 1)
Dr. Auto summons Shenron, but it results that the Shenron that he summoned was Black Smoke Shenron, and instead of granting his wish, Shenron possess 7 warriors.

Now Beat and Note must defeat the 7 possessed warriors and Shenron.

Gather! Dragon Ball Heroes! (Chapter 16, Volume 1)
In order to defeat Shenron and his possessed wariors, Beat and Note gather the seven strongest warriors.

Chapter 17-25
The 7 Dragon Ball Heroes fights the 7 possessed warriors that break the possession when the warriors are defeated.