In Episode 4 of "Alice in Borderland," Arisu grapples with overwhelming guilt and despair, contemplating giving up in the harsh world they've been thrown into. Meanwhile, Usagi, who is introduced tending to a rabbit caught in a net, becomes a source of encouragement for Arisu, urging him to keep moving forward despite the dire circumstances. The episode emphasizes their growing connection as they navigate the challenges of their environment together.