Also known as: おっぱいロープウェイ
When there is a noticeable gap between a girl's chest and the straps of her upper garment. Often due to the size and/or shape of her breasts.
Usually happens with a Bra, but can also occur with a Bikini, Tank Top, Camisole, etc.
If the gap is formed by lifting the strap, use Strap Lift instead.