KOZUMI Tsukiko

Fuyuko grew up as the only daughter of Hyuga Fisheries, a small business. One day, it was revealed she was actually the daughter of the major conglomerate, the Higashiyama Group. She was told to return to the main family and find a husband for the sake of the household. At first, Fuyuko ignored it, but then life-threatening harassment began...!? The life-or-death husband-hunting drama begins!!

Twin sisters born on a small and isolated island, ruled by the Takara family, the descendants of the sea god. Missokasu's The younger sister, Aoi, grows up in the shadow of her beautiful and popular older sister. She forms a strong connection with Ashawa the son of the Takara family. However, both the sisters were chosen as candidates for shrine maiden of Mikojin shrine and to be the bride of Ashawa...!? source: https://www.mangaupdates.com/series/fkochnj/kaijin-no-hanayome