Hajime annoys Sugane when she allows the MESS to escape. Later, she teaches Sugane about a popular social app called GALAX, which allows users in the vicinity to help each other, and decides to take him to an offline meet-up.

Hajime befriends the MESS, which she nicknames Messy, and the abduction cases involving the MESS stop. The other Gatchaman begin to wonder whether they were hostile at all. The next day, GALAX users at Hajime and Sugane's school receive word that some spoiled milk has been sent to their school, and they act together to warn the other students.

Rui decides to stand against Katze using the might of Crowds, but Katze uses the power of Gatchaman to overwhelm them. The Gatchaman team rushes to Rui's rescue, but find themselves outmatched.

Katze continues to distort Rui's vision, giving Crowds to people Rui had decided were too dangerous to have it, and staging attacks on government targets. Hajime sets up a 'Gatchannel' live stream, where Rui publicly apologies over the usage of Crowds and urges those that have it to not use it, and Hajime explains that the Gatchaman will confront Katze even if she is still unsure they can win. Hajime's determination inspires Sugane to confront J.J..

After taunting Hajime on GALAX, Katze sets the Neo-Hundred after the Prime Minister. The Gatchaman team are forced to protect him while trying to find a way to stop the Crowds without harming the users.

Rui regains control of X, and uses the GALAX network to help the Gatchaman team in the crisis. Hajime convinces the Prime Minister to broadcast a message on the Gatchannel, asking everyone to join the GALAX network and band together. But Katze takes the form of the Prime Minister, once again urging people to use Crowds.

As more citizens use Crowds and fight against each other, chaos breaks out. O.D. risks everything to retrieve Rui's NOTE from Katze. Hajime sends her mother a cryptic message, then leaves for a final showdown with Katze.