Anokoro Keroro Gunso: The War Competition for the Keron Star!! (あの頃ケロロ軍曹ケロン☆スター争奪大戦!!,Anokoro Keroro Gunsō Keronsutā sōdatsu taisen!!) or short title as Anokoro Keroro Gunso (あの頃ケロロ軍曹,Anokoro Keroro Gunsō)
is a card game featured in the Keroro Gunso franchise.
There are 20 cards in total in each season with 3 different types of cards (regular, hologram and seal). It features the winning entries Keronians used as characters in this game.
With each card pack a little bag filled with yellow or green candy would be given, the candy shaped as the Keroro Platoon's heads.
The events of this game take place before the Keroro Platoon landed on Pekopon, the main goal is to win the Keron Star by battling among other teams. Keroro, Giroro and Zeroro form their own teams and they fight with other teams. All the teams have different reasons to get the Keron Star.