Her arranged marriage partner is her first love─!? At 25, Hiyori has zero dating experience. She is a sheltered girl who hasn't even experienced a kiss. For such an innocent girl, a marriage proposal from the heir of the Saionji Group arrives…! To protect her family's inn business, Hiyori agrees to the arranged marriage, but her partner is her long-time crush, her first love 'Prince'─!? While Hiyori is overwhelmed with emotion at their long-awaited reunion, he looks at her with a cold gaze different from back then. 'Could it be, he’s forgotten about me!?' A complicated pure love story with her first love!