Akai Houseki no Himitsu
A Wife in Time·赤い宝石の秘密
An editor named Susannah attends a party at a book fair and notices a painting of a woman wearing a red necklace identical to hers. As she approaches the portrait, a strange light surrounds her, sending her back in time by a century. Kane Wilder, the CEO of an IT firm, who mistakenly believes Susannah is his brother's lover, somehow ends up accompanying her during the time shift.