Kurono Kei and Kato Masaru completed elementary school together and were later tested by Gantz, a mysterious black sphere. Through their encounters with exploding limbs, battles for survival, and lost comrades, they acknowledge Gantz's ability to summon them for future extraterrestrial conflicts. As Kato faces off against Gantz, could his experiences enable him to cultivate resilience in the real world? Meanwhile, Kei Kishimoto, Kurono's acquaintance, and a seasoned Gantz member, heighten his desire for her well-endowed chest. Nevertheless, the nature of Gantz remains unclear.