After trying to rescue a man on the subway tracks, two teens wake up in a room dominated by a mysterious black sphere that sends them to hunt down and kill aliens hiding on Earth.
A married woman with a lovely daughter lives a carefree life, until she meets her ex-lover at a friend’s wedding. They haven’t seen each other in ten years, but they begin an affair.
Summoned by the black sphere, Kei and Masaru fight against extraterrestrials until Masaru grows tired of fighting and refuses to continue.
