One day, your husband transforms into a woman...?
This drama explores the many differences of life, love and relationships can change in a world where peoples bodies can spontaneously alter sex!

Akira is a 30-year-old salaryman married to novelist Sonoko. After five years of marriage things between them have cooled and now they barely speak.
One evening Akira is suddenly struck with an unbearable headache and, after being taken to the hospital, is told his illness is life-threatening. At the same time, a strange change starts to take over Akira’s body. The Akira who walks out of the operating theater has transformed into a woman!
It turns out Akira has a rare medical condition known as “Sex Altering Syndrome” which can cause a sudden change in biological sex among humans. After receiving this diagnosis, Akira receives a “Altered Sex Certificate” and begins life as a man inside a female body.
Learning to use makeup, wearing a bra, Akira faces a steep learning curve in his first days living as a woman. After returning to work a few days later he encounters even more troubles. A client of his jokes that he can “touch boobs as much as he wants”, he’s even groped in an elevator, Akira begins to understand the daily struggles of life for women. Akira begins seeing the clear differences between perspectives of men and women after his transformation. Not only that, but for some reason he’s started feeling flustered around his helpful boss, is the transformation having more effect on him than he’d thought?
What awaits Akira now, as he begins to question what his real identity is?!


ある日、夫が女性になったら…？
突然性別が変わる架空の世界で、恋愛・結婚・夫婦の多様なあり方を描く新しいラブストーリー！

晶（あきら）は30歳のサラリーマン。5年前に小説家の苑子（そのこ）と結婚したが、今では会話も少なく、夫婦仲は冷え切っていた。
ある夜、強烈な頭痛に襲われた晶は病院に搬送され、命の危機を告げられる。しかし、その時、晶の体に変化が起きていた。手術室から歩いて出てきた晶は女性になっていたのだ！
性別が変わってしまう“異性化体質”は世界でも非常に稀な症例。診断を受けた晶は「異性化証明書」を受け取り、心は男性、体は女性としての暮らしが始まった。
初めての化粧、初めてのブラジャー、何もかも初めての女性の生活に戸惑う晶。数日後、会社に復帰すると、取引先で「自分のおっぱい触り放題だろ」とからかわれたり、エレベーターで痴漢に遭い、女性の苦悩や生き辛さを知る。性別が変わったことで見えてきた“男性の視点”と“女性の視点”の違い。さらに自分をフォローしてくれた男性の上司にドキドキするなど、徐々に感情も女性に変化してきて…
　“自分は男性？それとも女性？”性別が変わった晶を待ち受けるものとは！？