Otsubone Reijou to Shiyuka no Kisetsu - Reitetsu Saishou-sama no Okazari no Tsuma ni Natta Hazu ga, DekiaisareteimasuOtsubone Reijou to Shiyuka no Kisetsu; お局令嬢と朱夏の季節; お局令嬢と朱夏の季節 〜冷徹宰相様のお飾りの妻になったはずが、溺愛されています〜; Otsubone Reijou to Shiyuka no Kisetsu: Reitetsu Saishou-sama no Okazari no Tsuma ni Natta Hazu ga, Dekiaisareteimasu; The Noble Spinster and the Season of Red Summer

Alellia, who has had her engagement broken off, is past the marriageable age, and is known behind her back as the "domineering female supervisor". She spends her days performing her duties as the right hand woman of Marquess Istilia Wegmund, "the cold-hearted prime minister." One day, while performing her duties, the Prime Minister asks her to marry him. Rumor has it that the Prime Minister is in love with another woman. Alellia accepts the engagement, believing that she is being asked to enter into a contractual marriage. A newly-married life with the cold-hearted prime minister begins...!