The movie starts with the Sazer-X playing basketball. All of a sudden a flash of lightning strikes the earth. They headed for it, and discovered a boy. The boy was Riki, who assumed to forget everything. On the other hand, Remy informs the Sazer-X that a giant monster, 'Mecha Giant Beast Bulgario', had approached the Earth and were destroying buildings. The Sazer-X defeated the...。一个为CIA工作的神枪手决定做完最后一项任务就退休,却发现自己竟然成了CIA主管的打击目标,已经自身难保……。