Eileen

From a young age, luck has always been on Eileen's side. Although she lost her birth parents, she grew up with her foster father who was a policeman. She also managed to evade surprise exams and bag checks numerous times.

The only unlucky thing that happened to her was that she lost her foster father too soon. He met with an accident while investigating a secret organization, leaving behind nothing but clues about that bizarre school. Having been influenced by her father, Eileen's sense of responsibility drove her to get to the bottom of the matter. She successfully got into that school and survived till graduation, all thanks to her amazing luck.

Despite the weird sense of conspiracy enveloping the school, Eileen encountered something that made her happy.

During one of the school outings, her camera unintentionally captured a quiet girl named Charlotte. Out of curiosity, Eileen got to know her and found out that beneath that demure exterior lies a heart with passion for the truth.

Eileen's amazing luck, together with Charlotte's talent in deduction, enabled them to become the first twin champions in the history of the graduation game "GOOD LUCK". From then on, they are widely known as "best partners".

After graduation, Eileen set up Eileen's Detective Agency in Bloomsea. Albeit unwillingly, Charlotte took up the position as detective. Their first case was to uncover the secret behind GL. It turned out that the game is somehow related to the disappearance of Bloomsea citizens and the sudden appearance of Lenses in the black market.

Charlotte and Eileen joined forces and discovered that the financial backer of GL, as well as the power behind the Lens dealings, is Tobunkai. Together with the members of Muscipula, they headed for Tobunkai to find out the whole story.

Historically, there are many sayings about the real identity of Watson, assistant of the last Holmes. Among them, the most reliable theory presumed that he was not a Radiant, but a medium who was also a victim of the serial murders. As a descendant of the witch known to possess the "All-seeing Eye", he could communicate with the dead and enter everyone's dreams after his own death. That was how he helped Holmes find the culprit of the murders so quickly. After several encounters with the murderer, who had the power to travel freely between the Dream world and the real world, the two partners eventually locked him in a Dream constructed by Watson's soul. Holmes merged his own soul with the crumbling Dream to create two Lenses before he perished along with it.

Charlotte gradually realized her Lens is actually a Twin Lens. Other than Holmes, which she's linked to, she's also capable of choosing a Radiant for Watson's Lens.

Most importantly, as Radiants of a Twin Lens, their fates would be closely tied together. And that was how Eileen surprisingly, or rather luckily, became a Radiant as well.