An Observation Log of My Fiancée Who Calls Herself a Villainess: An Observation Log of Meeting a Self-Proclaimed Villainess.

When Crown Prince Cecil is ten years old, he takes Bertia as his fiancée. She claims to have memories of her past life, and says that this is the world of an otome game she once played. She also says that she is a villainess. Cecil is generally bored, but her extraordinary statements spark curiosity in his heart.