Okinodoku-sama, Kyou kara Kimi wa Ore no Tsuma

Sumika, an office worker, has been living in grief after losing her first love, Haruki, who helped her cope with the death of her only family. A work friend takes her to a party, where she meets Mr. Katsuragi, the vice president of the event's host company. Despite being their first encounter, he acts as if he already knows her well. When Sumika struggles to find a way to support the family that took her in, Mr. Katsuragi unexpectedly proposes to buy her hand in marriage.