Rumi is part of the demon-fighting girl group, Huntrix.

Huntrix is trying to strengthen the Honmoon (or magical barrier that keeps the populace-destroying demons away). If they turn the Honmoon into the GOLDEN Honmoon, THAT will seal away the demons permanently…

Note: how all of this expressed visually without Rumi having to say a word. We know what the demon patterns look like — and now we see that SHE HAS THEM. Rumi is half demon herself!! IF Rumi is a demon, she won’t be able to help Huntrix seal off the barrier. IF the demon rashes spread uncontrollably, she might go full-on destructive rather than saving the world… but all of this is implied with just one image. It’s very powerful.