She’s a plain, introverted girl at school who never stands out—her only “redeeming features” are her huge breasts and natural sex appeal. While she’s secretly popular with a few boys, she’s actually a closet nymphomaniac tormented by desires she can’t control.

Touch everywhere of her body and then use as you want. Humiliate Yui, who can easily talk about naughty things and doesn't seem to be embarrassed at all!

She accepts it with a smile, even the act of being filled. The thrill of using a girl who shifts expressions so freely, without restraint.