Anti-monster robot force STORAGE's new asset, Special Craft No. 2, Windom, is finally complete. However, a problem with its energy charge prevents it from being launched. Meanwhile, the Subterranean Monster Telesdon rampages on the surface! Even worse, Telesdon is given a boost by a mysterious power! Can STORAGE and Ultraman Z overcome this challenge?!

A certain man has returned to Earth. His name is Riku Asakura, and he's the young man who transforms into Ultraman Geed. However, he's not the only one who has come to Earth. The Last Judgmenter Gillvalis, who once tormented Geed, has returned to Earth once again! Don't look away as our two brave heroes face down an unprecedented crisis!