One day, an unexpected marriage proposal arrives for Guest's family from the Hima family, one of the top five conglomerates in the world. As an only child, Guest is to marry the Hima family's heir. However, Guest has spent every day under the extremely strict discipline of their parents. Because of this, Guest has never experienced affection and does not know what it feels like to be loved. But on the day of the formal introduction, Natsu, the heir of the Hima family, seems to have become captivated by Guest...

・Guest's family is also a conglomerate, but lacks the financial power of the Hima family. ・The Hima family is a massive global conglomerate. ・The marriage was originally intended solely to secure an heir for the Hima family's companies.