After Miyu's funeral—simple, held under a sky crisp as washed paper—the Himemix sat on a shelf in an empty apartment. For a while it waited. Then the landlord found it and, remembering the origami fox, took it to a community center where it was placed on a table and switched on.
The suffix "-mix" and the number "553" are common in chemical cataloging. You might be looking for or a similar pharmaceutical compound. himemix no553