Suzume Tōjō is just three months away from turning forty and realizes there’s so much he hasn’t done with his life! So, he makes a plan: create a private list of things he’s always wanted to do and check them off before turning the big four-oh. It’s a rather simple list, filled with goals that should be easy to accomplish, like a takoyaki party, enjoying a parfait out in a cafe, and spending his birthday with a lover. Except, that last one comes with a major problem—Tōjō hasn’t had a lover in ten years! But when Keishi Tanaka, Tōjō’s handsome junior at the company, discovers the secret list, he’s determined to help Tōjō check off every single item—starting with the “lover” part!

10年以上ぶりに恋人ができた十条雀（40歳）。 しかも相手は10歳年下のイケメン部下・田中慶司。 雀の目下の課題は「公私の切り分け」。 気を抜くと浮き足立ってしまう雀と慶司が決めたルールは４つ。 ①会社では今まで通りの距離を保つ ②仕事中は「雀さん」て呼ばない ③慶司ばかり見ない ④一週間守れたらご褒美 ルール順守を頑張る雀だったが――!? 【部下×上司】誠実に向き合って育む大人の恋