From Transient Mirage:

The lady Yurika has fallen in love at first sight with a 'yankee', Seiki!! Even though it's said that they live in different worlds, what actions did Yurika, who won't give up, take? When Yurika's bodyguard and fiancé barge in, too, the future of her romance is thrown into chaos. But the love between a lady and a 'yankee' is intense, passionate, and a little sensational! Love is a one-on-one match!