Sword Art Online Season 4 Episode 15 The War of Underworld

Asuna, Sinon, Leafa, and Lisbeth continue their battle against the American players, who have been receiving overwhelming support from their government. The Japanese players are struggling to keep up, as the Americans have superior weapons and tactics, but Asuna refuses to give up. She rallies her team and devises a strategy to turn the tide of the battle.

Meanwhile, Kirito remains in his coma, connected to the Underworld through a new device called the Soul Translator. Asuna desperately tries to reach him, but she is met with resistance from the government officials overseeing his condition.

Back in the Underworld, the Dark Territory army launches a surprise attack on the Human Empire, catching the players off guard. They quickly regroup, and Kirito's allies band together to defend the city. As they battle the Dark Territory forces, they begin to gain the upper hand.

As the episode comes to a close, tensions rise between the American players and the Japanese players. It becomes clear that the two sides will need to work together if they hope to survive the upcoming battles. The episode ends on a cliffhanger, leaving viewers eager to see what happens next in The War of Underworld.