Amidst the cheerful summertime ambiance, Pikachu and their companions are brimming with enthusiasm. A beach ball adds to their joy as they revel in playful activities. However, as they splash around the nearby river, they unexpectedly stumble upon a bustling city. Mesmerized by the towering constructions, Pikachu and Pochama question their whereabouts. However, their curious exploration is interrupted by Pichu and Muchul's contentious squabble over the disappearance of the Sparkling. The gift was crucial, as Kireihana's birthday was that day. The search for the lost item was a complex endeavor, as their mischievous foes, Nyarth-tachi, were also in pursuit. Thus, commenced the challenging mission of finding the Great Sparkling.