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.
Summoned by the black sphere, Kei and Masaru fight against extraterrestrials until Masaru grows tired of fighting and refuses to continue.
Ichiko works as a private nurse for a family she almost became a part of. While Ichiko cares for the grandmother, she is also a confidant to Motoko, the eldest sister. But one day, Motoko’s younger sister disappears. And the media soon reveal the kidnapper to be Ichiko’s own nephew.
