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 enhanced by a mysterious power! Can STORAGE and Ultraman Z overcome this challenge!?

STORAGE members are assigned to escort Ultra Medals to a research institute under the GAF's orders. But aliens are also aiming for the Ultra Medals, which are said to be the treasure of the universe! How can STORAGE deal the enemy space robot King Joe and how will Ultraman Z face it?!

A new weapon has been developed from the recovered remains of Baraba that uses the abilities of the Extradimensional Being Yapool! Haruki and the others are against using this weapon’s terrible powers, but at that moment, the Brutal Space Monster Kelbim appears! The new weapon, “D4,” is equipped to King Joe STORAGE Custom. Will Yoko be able to pull the trigger?!