Gantz: Perfect Answer

Summoned by the black sphere, Kei and Masaru fight against extraterrestrials until Masaru grows tired of fighting and refuses to continue. Summoned by the black sphere, Kei and Masaru fight against extraterrestrials until Masaru grows tired of fighting and refuses to continue. Summoned by the black sphere, Kei and Masaru fight against extraterrestrials until Masaru grows tired of fighting and refuses to continue. Summoned by the black sphere, Kei and Masaru fight against extraterrestrials until Masaru grows tired of fighting and refuses to continue.