Mirepoc uses her day off to investigate about an old gentleman named Lascall Othello, who murdered an actress named Parney Pearlmanta eight years ago and used Yor, a sword that has the power to remove a book from her dead body. However, a rumor spread about Lascall and there were some con artists who either pretended to be him or offered to introduce him for a fee. Since Mirepoc is so determined to find Parney's book and solve this mystery, Mattalast is sent to watch over her for the time being...