GCREST released the official LINE messenger theme of the 100 Sleeping Princes and the Kingdom of Dreams 2 smartphone game. The theme is available in most of the regions where you can reach the LINE services and you can buy it for 1.99 USD / 360 Yen but in Japan during a campaign period you can get it for 240 Yen (with tax).
In the galler you can find the sample pictures of the theme and here is the LINE store link: https://store.line.me/themeshop/product/4c247281-2a2b-41b2-b884-345913fcf0d8?id=4c247281-2a2b-41b2-b884-345913fcf0d8