Kidou Senshi SD Gundam no Gyakushuu
English name: Mobile Suit SD Gundam's Counterattack
Genres: Comedy
Type: OVA, Episodes: 2
Aired: Jul 15, 1989
Studio: Sunrise
Source: Original
Rating: PG-13 - Teens 13 or older
Synopsis:
It consists of two parts:

1. "The Storm-Calling School Festival" - Char and Haman host a festival to celebrate the union between the Nu School for Boys and the Zeta School for Girls. But all hell breaks loose when the Counterattack School gang - led by Amuro, Judau and Kamille - rush in to crash the party.

2. "The Tale of the SD Warring States: The Chapter of the Violent Final Sky Castle".