Kaede, the still-developing younger sister, has a pure and obedient nature, always trusting and complying with her older brother's words. When her brother invites her to go to bed while they're playing together, Kaede follows his suggestion without hesitation. Surprised by his sudden advance, she remains unaware of his true intentions, continuing to obey him without question. Seeing her innocent demeanor, her brother becomes overwhelmed with desire, reaches for her petite body, and upon hearing her soft, embarrassed moans escaping her lips, can no longer restrain himself...!