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 be wed to the Hima family's heir. However, Guest has lived a life under the strict, oppressive discipline of their parents. Having never experienced affection, Guest has no concept of what it feels like to be loved. But on the day of their first meeting, Natsu, the Hima heir, seems to have been instantly captivated by Guest...

• Guest's family is also a conglomerate, but their wealth does not compare to the Hima family.
• The Hima family is a massive global power.
• The marriage was originally arranged solely to secure an heir for the Hima family's companies.