The speaker addresses Marina, someone they knew who has vanished, and the poem suggests she was part of an online community built around self-harm and a fragile "pastel" aesthetic. At first she seems like a mentor, teaching first aid and how to hide pain, but the speaker also feels she drained everyone around her: she took love and support and never had enough. Then she disappears, as suddenly as a deleted page ("404"), and a late-night message, possibly from her sister, implies she died.
The speaker's feelings are tangled. There is grief and tenderness in the repeated question "where have you gone?", but also bitterness and a kind of numbness, since the group simply moves on to "new idols." The final lines turn the question outward, as someone struggling now asks it too. The mood is bleak, quiet and haunting, like a shadow ("a burgundy cloud") that never quite lifts.