Gntarl commands the united armies opposing the Magical Kingdom and its ruler, Munto. He operates under the authority of the Elders of the Heavens, the Seven Heads, yet acts on personal ambition and a hunger for power. His primary objective directs military campaigns against Munto's kingdom to seize control, driven by the conviction that eliminating the Magical Kingdom will preserve the dwindling Akuto energy vital for the Heavens' survival.

After Yumemi Hidaka restores the Akuto flow to the Heavens, the renewed energy incites corruption and warfare among the Heavenly kingdoms instead of bringing stability. Gntarl shifts focus toward acquiring Yumemi herself, recognizing her as the Akuto's source and seeking to harness her power for regulation and control. He justifies this as necessary to prevent further chaos, viewing Yumemi's existence as an inherent danger to the celestial realm. To achieve this, he employs aggressive tactics, waging an assault on Yumemi's Earth location and later seizing her friends as hostages to force her surrender.

Gntarl's antagonism toward Munto extends beyond strategic opposition into personal resentment and rivalry, though the animosity's origins remain unspecified. His methods reflect ruthless pragmatism, culminating in a confrontation where Yumemi, empowered by her determination to protect her friends, overpowers him. This defeat leads to Gntarl's capture and imprisonment by the forces of the Magical Kingdom, ending his active role in the conflict. His character exemplifies a relentless pursuit of dominance under the guise of preserving order, ultimately undone by his refusal to adapt to changing circumstances and his underestimation of Yumemi's resilience.