What TTGL does with galaxies, Summer Wars does with a card game.
Natsuki’s clan challenges the Love Machine to a game of Hanafuda Koi Koi, where the world is at stake. Accounts are placed on bet, accounts stolen by the virus in order to wreak havoc on every man-made system imaginable. Thanks to their lifelong experience from playing with Grandma, they beat the virus a couple of times in a row, but then Love Machine strikes back and takes most of their winnings.
Unable to meet the betting minimum anymore, Natsuki succumbs to despair.
And that’s where everyone steps in to add their accounts to the pot. In a moment unprecedented in human history, the whole world unites behind the banner of Natsuki and her clan.
The final card is presented with much pomp and flourish that decisively tops Saki’s mahjong scenes. Only the strength of anime could make you so pumped up over such an otherwise trivial card game. Hooray for animation!