Today, my sister Sara Kagami becomes our family's newborn baby! A complete simulation experience where she'll be pampered and live like a regressed infant. Our troubled family decides that the best course of action would be... to put her through a life-changing makeover? As Miwa Suzaki takes care of her, every day is filled with embarrassment and humiliation. She has to wear diapers all the time, so she can never hold it in without wetting herself. Her feedings are limited to breast milk, and she's even forced to sleep with a pacifier. If she gets caught masturbating, she'll get spanked on her bare bottom with a paddle! But despite all this, she's constantly praised and spoiled by everyone around her. It's hard not to fall under Miwa's maternal charm, especially when she's always smiling and doting on her. After experiencing 30 days of being forced to live as a helpless baby, you might find yourself wishing you could stay forever... or at least try it out once.

「今日から私、家族（みんな）の赤ちゃんにされちゃいます」――完全シミュレーション！甘やかされ退行ライフ！ 態度もカラダもだらしなさすぎる姉・さら。トラブル続きに悩まされた家族が下したのは……まさかの育て直し処分！？ 「さら、お前は今日から次女に降格、赤ちゃんから人生をやり直してもらう！」 「今日から私がちゃんとお世話してあげるからね、お姉ちゃ……さらちゃん？」 ドSな妹・みうのお世話は、毎日が羞恥の連続！24時間おむつで生活！だからトイレに行けずにいっつもおもらし！離乳食を食べさせられたり、絵本で寝かしつけられたり、オナニーしちゃった悪い子にはお尻ペンペン愛のムチ！ でも、ご飯食べてもお着換えしても、ダダ甘やかされて褒められちゃう！美羽から溢れる母性に蕩けさせられるなら、赤ちゃんにもなってみたい……かも？！ 一度は体験してみたいあなたに贈る、無理やり赤ちゃん生活30日！※ 配信方法によって収録内容が異なる場合があります。