Kurono Kei and his former elementary school classmate, Kato Masaru, have survived the first two ordeals the mysterious black sphere Gantz has sent them through. Experiencing explosive body parts, fighting to stay alive until the last seconds, and watching their comrades fall into piles of blood and gore have become normal to them. They now understand that Gantz can summon them for new missions at any time, forcing another confrontation with extraterrestrials. Will Kato’s experiences in the Gantz world grant him the same courage in the real world? With veteran Gantzer Kei Kishimoto currently staying at Kurono’s home as his “adopted pet,” can Kurono resist his growing attraction to her? What the heck is Gantz?