「お兄ちゃんを絶対に部屋から出してみせる！」部屋にこもってゲームばかりしている引きこもり兄・ユウトを救うため、超優秀でエッチ大好きな4人の美少女妹たちが立ち上がった！？フレンドリーなお風呂あらいっこで迫る陽キャ女子大生の長女のマイ！可愛らしい関西弁とひざまくら耳かき！手コキの研究に必死な努力家●校生の三女・ハナ！チャイナ服コスプレや電マオナニーまで受け入れちゃう真面目な黒髪美女の次女・ナツキ！そして「エッチな事してもいいよ？」と禁断の提案で体当たり説得を試みる熱血童顔●校生の四女・ヒカル！次々と部屋へ突撃する妹たちは、兄を社会復帰させたい一心であの手この手の超濃厚で刺激的な大奮闘！ 予想外のハプニングから始まるドタバタ＆エロエロな展開！！妹たちの過激で愛が深すぎる強力サポートで、果たして兄は無事に部屋から抜け出し、社会復帰できるのか！？ノンストップ胸キュン家族救済ドキュメント！？

"We'll get big brother out of his room no matter what!" To save their shut-in brother, Yuuto, who spends all his time holed up in his room playing video games, four super-talented and sex-loving beautiful younger sisters rise to the challenge!? There's Mai, the eldest sister, a cheerful college student who approaches him with a friendly bath-washing game! Hana, the third sister, a hardworking high school student who is desperately researching handjobs, with her cute Kansai dialect and lap pillow ear-cleaning! Natsuki, the second sister, a serious, black-haired beauty who even accepts Chinese dress cosplay and vibrator masturbation! And Hikaru, the hot-blooded, baby-faced high school student, the fourth sister, who tries to persuade him with a forbidden suggestion: "Is it okay if we do something naughty?" The sisters storm into his room one after another, desperately trying to get their brother back into society with every trick in the book, in a super intense and exciting struggle! A chaotic and erotic development begins with an unexpected mishap! With the sisters' extreme and deeply loving support, will their brother be able to escape his room and return to society safely!? A nonstop, heart-pounding family rescue documentary!?