Daikichi Karube, a loyal and physically imposing figure with light blond hair and a muscular frame, left school in his early teens to work as a bartender before entering the Borderlands. Though raised on opposite sides of town, his enduring friendship with Ryohei Arisu and Chota Segawa solidified in later years. A workplace clash over a romantic entanglement cost him his job, triggering events that thrust the trio into the parallel world. Within the Borderlands, Karube’s pragmatic instincts and protective drive emerged swiftly. During the Three of Clubs game, he pushed Arisu into decisive action during a life-threatening crisis and shielded Chota from harm. His strength and tactical acumen proved vital in the Five of Spades game, where he battled mechanized foes despite sustaining injuries, consistently prioritizing the group’s survival through leadership in perilous scenarios. Karube’s loyalty crystallized during the Seven of Hearts game. Though resolved to survive, he ultimately sacrificed himself after reflecting on his bond with Arisu and Chota. The live-action adaptation framed his final moments with a quiet cigarette and explicit farewell, while the manga rendered his fate offscreen, abrupt yet resonant. His choice to value his friends’ lives above his own marked a turning point in Arisu’s journey. Unfulfilled aspirations, including plans to propose to a romantic partner, layered emotional weight into his decisions. Narrative adaptations diverged slightly: the manga cast him as a bar owner, whereas the live-action series stressed his dismissal and internal conflicts. Both iterations, however, cemented his role as a fiercely loyal yet flawed protector. Karube’s arc transitioned from carefree defiance to a grim acceptance of the Borderlands’ cruelty. His willingness to collaborate with survivors like Saori Shibuki and Shuntaro Chishiya revealed an unexpected capacity for trust amid brutality. His influence endured through Arisu’s later trials, anchoring his friend’s resolve and underscoring the enduring power of human connection in desperate circumstances.