Oh. Well it seems just to be an aesthetic that surrounds...milk. I don't know much about it, but I keep seeing it around.
From what I've seen it has a light pink and light blue motif, sweets like cheesecake, strawberry milk, and milkshakes.
A girly fashion of skirts, sweaters, and graphic t-shirts. Comfy but cute clothes I guess.
I've seen hello kitty and strawberry shortcake sometimes used, as well as some animes. Seems to have either japanese, korean, or english labels on the milk cartons.
Umm...yeah. That's all I know. I don't know how it originated or if it's a branch of something else.