"A young noblewoman whose hobby is observing people observes other aristocrats at tonight's ball"

The Count's daughter, Levenda, openly declares that "her hobby is observing people," and is always observing other nobles at evening parties. Her keen eye for observation is so sharp that she can even see through the health conditions and infidelities of nobles who tried to tease her. This detective-level observational ability stems from her upbringing, and Levenda also felt loneliness. And then, the Duke's son, Lias, appears before her……