Rikon Sunzen!? Kamen Fuufu Kara no Dekiai Seikatsu: Kowamote Gunjin wa Oku-sama ni Muchuu desu

As the daughter of a bankrupt Count, Leila's fate hinges on repaying the loan her father took from the businessman Maximilian Volkov. Missing even one payment could force Leila into marrying him as compensation. With the repayment date approaching and little hope of meeting the deadline, Leila is unexpectedly saved by her first love, a wealthy Colonel named Silvester, who proposes marriage. Although Leila has always dreamed of marrying for love, Silvester insists theirs will be a marriage of convenience and refuses to consummate it. Despite her belief that divorce is imminent, their arrangement continues for three years. Then, one day, Silvester is attacked and loses his memory. Strangely, he begins treating Leila with utmost tenderness, showering her with affection. In a surprising turn of events, their relationship shifts from the brink of divorce to a loving, affectionate marriage with just one incident. (Source: POCKET COMICS)