"Ayane-chan, will you marry me?" A sudden proposal from a childhood friend who is 10 years younger than her? --- Ayane Kakihara, 34 years old, is actively looking for a marriage. She just got dumped on a date today, saying, ``You don't need a man for the rest of your life, do you?'' Her mother called and said, ``I've sent you a good person,'' and the person waiting in front of her house was her childhood friend Itsuki. Ayane is confused by the sudden proposal from a man who has even changed her diaper. Although she refuses because he sees her only as her younger brother, she has a soft spot for Itsuki, whom she has always loved. She allows him to live with her for a week and approach her every day. A week has begun where you will be at the mercy of the trees that will approach you if you give them a chance! 「綾音ちゃん俺と結婚しない?」 10歳下の幼馴染から突然のプロポーズ? 婚活中の綾音は今日もフラれたばかりだった。 そんな綾音の前に現れた幼馴染の樹。弟としてしか見られてないと拒否するものの一週間の同居とアプローチの日々を許してしまう。 隙あらば迫ってくる樹に翻弄されっぱなしの日々が始まった!