As a spin-off of the long-running Doraemon manga, The Doraemons follows the adventures of the six different Doraemons that first appeared in the 3DO game, Doraemon-Legend of Friendship, The Doraemon. The Doraemons, also known as Dora Dora Seven (DD7), function as an old boys' association from the Robot School that Doraemon attended. All seven male members are cat-like robots of the same type who enjoy dorayaki, though they usually add their own preferred seasoning. They possess rock-hard heads that they can use as weapons or to break out of prison (among other things), a capability that is even more enhanced in Doraemon since he has no other special weapons and lacks ears or a hat to obstruct this mode of attack. The gadget that connects them is the Friendship Telecard, which allows them to call each other from anywhere and at any time when one or more members are facing problems.