While cleaning up the rubble from STORAGE's past battle against Gomess, Haruki in Sevenger was assigned to protect the sheltered civilians from a space monster Genegarg while crossing paths with the young Ultraman Z.^[1] Z bonded with Haruki when the young man lost his life and gained access to Alpha Edge, using his new power to destroy the space shark. After the battle, Z entrusted Haruki with the mission to recover the scattered Ultra Medals from Genegarg while a space parasite named Celebro possessed Shinya Kaburagi.^[2]

In Sevenger, Haruki was defeated by Neronga's constant use of invisibility.^[1] When the STORAGE crews anticipated its attack on a power plant, Z rescued Yoko/Sevenger from Neronga, and managed to defeat it through Haruki's prior training with Hebikura.^[3]

After a disastrous attempt in fighting Guigass, STORAGE was ordered to transport an ancient monster Gomora to an uninhabited island after a construction company discover it in a mountain.^[4] Haruki piloted Sevenger to assist with the removal while Kuriyama negotiated with the executives from Global Allied Forces America. As Z, he regained the Ultraman Medal from Yoko, allowing him to become Ultraman Z Beta Smash, using this new form to destroy the monster. The meeting with Global Allied Forces America was successful enough for STORAGE to receive funding into their new unit.^[5]

SAA-2 Windom was completed but to Yuka's dismay, massive revamp in its internal structure caused the machine to extend its charging period for four days while STORAGE has trouble with handling Telesdon.^[4] Using a piece of Neronga's horn, Yuka circumvent its charging period, allowing Yoko to support Ultraman Z. The Celebro-possessed Kaburagi tested his Monster Medal by imbuing Teledon with Jirahs' powers, but this did not stop the Ultraman/robot pair from defeating it.^[6]

A freezing monster, Peguila arises and make its way to Tokyo to destroy the ancient tool used to seal it. Yoko attempted to dispatch with Windom, but was caught frozen.^[4] Further worsened by the fact that Hebikura/Juggler briefly steal the Z Riser, Haruki was forced to use Sevenger to rescue Yoko before he can transform into Z and utilized the Z Lance Arrow to destroy it. To test his Dark Z Riser, Juggler transformed into Zeppandon and was defeated by the same Ultra.^[7]

While STORAGE were conducting a simulation battle, a revived Gillvalis appeared and was reduced to his core by Geed. STORAGE are assigned to capture it, leading to a reunion between Z and Geed. At the end of the battle, Haruki and Riku formally introduce themselves while Kaburagi set his sight on the latter.^[4][8]

Riku was kidnapped by the Valis Raiders to be extracted of his genes,^[9] which Celebro uses alongside a Devil Splinter to create Belial Medal. After being freed by Juggler, Riku joined Haruki as their Ultras faced against the Belial Fusion Monsters, with Zero aided the battle as well. After the fight, Geed and Zero left Earth as they trusted Z's role as the planet's protector.^[10]

Using samples gathered by Alien Pitt sisters that he brainwashed, Celebro becomes Tri King to demonstrate its power and had Yuka and Yoko captured after mistaking them for Z.^[9] When Tri King further upgrades into Five King, Hebikura supplies Z with the Medals to assume Gamma Future and turn the tides of the battle.^[11]

After three Ultra Medals were stolen by Alien Barossa, STORAGE members are assigned to escort the other three in their possession to JAERC under the GAF's orders.^[9] Haruki, Hebikura and Yuka served as the bait for Barossa's King Joe while Yoko delivers the actual Medals, but Celebro ruined their plan into a three way battle. Z reclaims the Medals, using Gamma Future's ability trick King Joe into splitting while harnessing Lightning Generade to disable said robot. As GAFJ begins salvaging the King Joe, Alien Barossa made it out unharmed.^[12]

Barely surviving King Joe's destruction, Alien Barossa made it out and broke into STORAGE's headquarters to reclaim King Joe.^[9] After being attacked by Juggler and the rest of the STORAGE members, Barossa exited the base and grew large to fight Z. Yoko handed Z the Ultra Medals that Barossa had stole previously, which he uses to kill the alien pirate.^[13]

Haruki returns to his hometown for the anniversary of his father's death.^[15] While defending his town from a pair of Red Kings, Haruki was too late to realize of the monsters' purpose of awakening to protect their unhatched child when Z killed the father, forcing him to spare the mother from STORAGE's new SAA Unit, King Joe STORAGE Custom.^[16]

Because of the trauma from killing Red King, this affected Haruki greatly even when fighting as Ultraman Z in against Grigio Raiden.^[15] With King Joe STORAGE Custom fixed, Yoko went on piloting it in a coordinated attack against the monster, going as far as to kill it despite Haruki and Hebikura's orders.^[18]

Using Bullton, Celebro creates a massive chaos inside the STORAGE base.^[15] At this point, Haruki was sent to the past when his father was still alive and receiving advice over the decision to protect others even if it means hurting someone else. As he return to present, Haruki regains his composure to fight properly as Ultraman Z.^[20]

As a result of Bullton's destruction, it created an imbalance which summoned Greeza onto Earth. Riku was alarmed by this event and joined Haruki/Z and Juggler/Five King, only to be absorbed in a futile attempt to catch the space needle.^[21] In order to save Riku/Geed, Haruki and Juggler obtain the Belial Medal from Celebro to use its power alongside Zero and Geed, forming Z Delta Rise Claw. After saving Geed, Z obtained the Space Needle Beliarok and destroy Greeza. Geed gave Haruki his Ultra Medals as his Geed Riser was fixed, continuing his mission in tracking the Devil Splinters in outer space.

Haruki accompanied Yuka to her hometown in Shishigaoka to prevent Horoboros' awakening.^[22] Although she succeeded in pacifying the monster, Celebro turned Horoboros into a rampaging Metsuboros and forced Z to put it out of its misery.^[23]

Continuing from the previous episode, Alien Barossa II set his sight on the Beliarok and further created a three way battle with Haruki and Juggler over the sentient sword.^[22][24] As he lost the weapon's ownership, Barossa II decided to avenge his brother by fighting Z and was killed when the Beliarok returned to Haruki on his own accord. Elsewhere, Celebro possessed the GAFJ captain Asano when Kaburagi's body became too injured to be used, pinning his former host as the scapegoat to his past atrocities.

Haruki met a strange woman named Kaori in the middle of investigating disappearance cases in Kirimoto City.^[22][25] As he found out, Kaori was one of the many victims of Kemur during the aliens' first kidnapping schemes on Earth back in 1966, while she was forcefully used to become a living cover when the alien restarted their attempt in 2020. Using the Beliarok, Z split Kaori from Kemur and disposed of the alien's bomb into a pocket dimension.

Terrible-Monster Baraba was reborn from Yapool's grudges against Ace, fighting Z using its wide array of abilities.^[22][26] Ace appeared to assist Z in fighting the remnant of his old foe and combine their attack to form Space Z.

In his day off, Kojiro Inaba visited his daughter Ruri, whose research on the artificial life form M1 grew into gigantic proportions due to a group of terrorists trying to kidnap it. Instead of killing it, STORAGE launched their operation to lure M1 away from the city while preparing the shrinking antidote.^[27][29] Through Z's help, he managed to held the creature off before Inaba shrank M1 back to its original size.

A new weapon called D4 was created by implementing Yapool's extra-dimensional energy.^[27] In the midst of STORAGE's protest against using this superweapon, a horde of Kelbims sent by their mother set their sight on said energy source.^[30] King Joe was fitted with the D4 Ray and opened fire on the Kelbims, creating a massive energy backlash that tore reality apart before Z destroyed it. Due to STORAGE's protest against D4, Kuriyama had them disbanded.

3 days after STORAGE's disbandment, Haruki and Yoko spent their day off at Sevenger's exhibit where Yuka and Inaba worked at. Meanwhile, the SAAG developed Ultroid Zero to wield the D4 Ray technology while planning to extract the secret of Zestium Beam to stabilize it. Alien Barossa III appears to avenge his brothers' deaths and was joined by Juggler/Five King in fighting against Z. With the SAAG recruit fail to even properly piloting the King Joe STORAGE Custom, Yoko was forced to on board Sevenger and used Beliarok to kill Barossa. On the other hand, Five King managed to trick Z into firing his beam, allowing SAAG to extract Z's data while Juggler lost his medals to an unknown figure. Former STORAGE members walk to separate ways as Yoko becomes the Ultroid Zero's pilot.^[27][31]

One month after the Kelbim and Barossa III's attacks, Ultroid Zero was put into test by Yoko at the same time when five monsters simultaneously made their move against the robot due to the presence of the D4 energy substance.^[32][33] Z interfered by having Takkong and King Guesra retrated, but the Ultroid Zero shorted out after firing the D4 Ray against Gomess, Pagos and Demaaga. While rescuing an unconscious Yoko, Hebikura revealed his true identity to Haruki/Z.

After reclaiming the base from SAAG, STORAGE members put their operation to save Yoko into motion. Haruki/King Joe STORAGE Custom, Juggler/Windom and Inaba/Sevenger intercepted Destrudos where Haruki managed to punch his way into the cockpit as Yoko purged Celebro from his control and retrieved the Belial Medal for Haruki to transform into Z Delta Rise Claw. After being reduced to his original form, their resolve empowered Z's Zestium Beam to surpass the D4 Ray and finally destroying Destrudos. Celebro was captured by Yuka and Kaburagi to be dissected during his attempt to escape. Juggler and Haruki parted from STORAGE to space, the former to his own agendas while Haruki retain his bonds with Z to do rescue operations in outer space.^[32][35]