In the enigmatic Ayaka City, the sudden arrival of the mysterious Ultraman Tregear stirs curiosity. Tregear poses a thought-provoking question about the lengths one would go to fulfill their dreams, leading Katsumi to embark on a quest to discover his own aspirations. After a year of peace, a monster emerges, prompting Ultraman Blu and Ultraman Rosso to team up with Ultraman Geed to confront this fresh menace. United by the spirit of the Minato family, they forge ahead towards their dreams, giving rise to Ultraman Gruebe.