*Text: "Starting a new label - A release will be out in the spring!"
The rest of the text on the page is the same exact text that was on the red postcard given out at BEST★Xmas. If you didn't see it yet: Link
This tells us that "her" is under Victor Entertainment (a subsidiary of JVC Kenwood that produces and distributes music, movies and other entertainment products such as anime and television shows in Japan); more specifically, they're under the "Colourful Records" imprint.
"her" = The new imprint label that SCANDAL is starting
We, SCANDAL, are launching a new imprint record label called "her."
To be able to make our own "atelier," kitchen," and "playground," we are delighted to be able to relish an excitement like this during the tenth year since our major label debut.
From this point forwards as well, we will be delivering a ton of good music from "her."
Please look forward to it.
This info comes from fans who attended BEST Xmas, who were given tote bags, postcards, and stickers with "her" printed on them. Will post more info when it's out!
Answer: On December 24, 2018 at their BEST★Xmas Christmas show, SCANDAL announced that they have signed with Victor Entertainment and have established a new, imprint label on it called "her." They will be releasing all of their new releases on it from this point on, with the first release set to be out in the spring 2019.