Engagement with the person you admired. She always felt dreamy, like a fairy tale. But this marriage was the beginning of love and sin - Michio was engaged to Akatsuki, the eldest son of the Rokuhara family. She thought it was fate, but the person she met was actually his twin brother, Saku. Saku, who was born as the son of a wealthy family and is imprisoned, is trying to use Michio to carry out a certain "plan"...! ! The gorgeous marriage story begins!