Kurono Kei and his former classmate, Kato Masaru, have faced harrowing trials orchestrated by the enigmatic black sphere known as Gantz. Amidst the chaos of exploding bodies and desperate battles for survival, they have grown accustomed to the brutality of their new reality. Now fully aware that Gantz can summon them for further encounters with extraterrestrial foes at any moment, the two must grapple with the question: will Kato's resilience in the Gantz world translate to strength in their everyday lives? Meanwhile, Kurono finds himself harboring conflicting emotions towards his fellow Gantzer, Kishimoto, who has taken up residence in his home. As Kurono navigates his complex feelings and desires, one mystery looms large: what exactly is Gantz?