Seina Isolde is a socialite with a villainous reputation. She was accused of bullying the crown princess, taking advantage of her role as the crown prince's fiancee. When the scandal broke, their engagement was broken off, and she took her own life. But then, an anonymous letter claims that Seina Isolde was murdered. Aria, the prime minister's daughter, is assigned to investigate. After she interviews the people involved, what emerges is a surprisingly picture of Seina. Seina had been used and exploited by the people around her, and she was forced to hide her true self and act like a villainess instead. Why did she have to die? And who sent the letter? As Aria searches for the truth, things take a dramatic turn…!

(Source: Alphapolis, translated) Translated with DeepL.com (free version)