Kishin Kakka No Migawari Hanayome
鬼神閣下の身代わり花嫁 ; 鬼神閣下の身代わり花嫁 〜世継ぎができたら離縁です〜 ; Kishin Kakka no Migawari Hanayome ~Yotsugi ga Dekitara Rien Desu~;Becoming the Demon Lieutenant General's Stand-In Bride ~Once An Heir is Born, We Must Part~
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Tsukiko, once deemed frail and insignificant, finds herself thrust into the role of her twin sister, who was betrothed to His Excellency, Kishi—a formidable man known as the 'Demon God' for his unwavering resolve and rapid ascent to the rank of Lieutenant General. Despite his fearsome reputation, Tsukiko recalls a fleeting moment of kindness from him that offered her solace amid her struggles. However, the reality of their arrangement is starkly revealed when he brusquely informs her that her worth lies solely in fulfilling her duty: bearing a son to secure his lineage. In a cold and calculated statement, he declares that should she bear his successor, he will dismiss her without hesitation.