About the Oosaki sisters' bodies.The position of the bust and the hips are lowish so there's not a lot of flesh hereSlim~~~squeezeSlim~~~I think Amana-chan usually wears a plunge bra and makes her cleavage that way
Tenka-chan might wear one when working?
Normally she wears non-wire bras and sports bras and such. She has a slender waist but on whole is slim.Dainty and a light body. Their wrists and ankles are probably really thin.
Both of them don't have a lot of body fat percentage or muscles, so their legs don't have a lot of flesh on them when they're standing.Their bodies aren't that tall but they have long necks and slender arms and legs so they're suited for high-teen models.
It's like they have the bodies that teen girls these days strive to have.They're thin but they have fine skeletons, so their backs only just show, and as a whole their bones don't stand out. But the ribs might be visible…Partially because they're twins their bodies are almost the same weight and size. From the illustrations and standing graphics, there's not a lot of difference. Tenka-chan's a bit heavier and bigger but it's within a margin of error so maybe there's no point in comparing the two