In the "Surprising Our Sister On Her Birthday! (Bongga!)" video, Ranz and Niana plan an elaborate surprise party for their sister's birthday. They organize decorations, gifts, and a fun celebration with friends and family to make the day special. The video captures the excitement of keeping the surprise under wraps and the joyful reactions when their sister realizes what’s happening. Filled with heartfelt moments, laughter, and a sense of family love, it showcases their dedication to making their sister feel cherished on her big day.