Kanata, Miko, Luna, Shion, Chloe and Marine normally spend their time streaming on the Holocas app. When anxious, stressed people lose their positive outlook, their souls get drawn into Holocas World, a magical realm born from the gathered light of people's hearts. This is called Yumeochi, and when enough of it builds up, monsters called Collapsers appear. The six are granted the ability to become magical girls known as holoWitches, and they fight Collapsers to rescue those trapped in Yumeochi and bring people hope. The single-episode ONA mixes mahou shoujo and slice of life, and it belongs to a wider multimedia project starring hololive VTubers.