This special was broadcast within the Queen Millennia TV anime special, "Summer Anime Matsuri Special: Arale-chan's Family Appears! Who is Queen Millennia!?" It is a crossover between the Dr. Slump: Arale-chan and Queen Millennia anime television series.
It is Akane and Tsukutsun’s wedding. However, Arale seems to be nowhere to be found. Senbei Norimaki and everyone else search for her.. until she surprises them all.