​Aki and Sora Aoi, two siblings with a close bond from childhood, discover a forbidden love for each other. While coming of age, they indulge their deep affections in secrecy, keeping their younger sister Nami in the dark about their relationship. Unaware of the brewing passion within her household, Nami attempts to play matchmaker between Aki and her best friend, Kana Sumiya. Amidst these complicated dynamics, Nami harbors hidden feelings for someone close to her. Delve into this enticing tale of taboo love, emotional entanglements, and hidden desires in this captivating episode of erotic anime, where boundaries are shattered and passions run wild.​