Tendou Sakura, a new member of society who will start working at a bookstore this spring, likes mystery novels and solving riddles more than just three meals a day. When she was in high school, she started a mystery research club, but there was only one member, perhaps due to her dark personality. Every day in her life, not a single incident occurred, and she always felt bored. However... Sakura, who had started living alone before her new life, was nervously greeting her neighbor when suddenly a woman's scream echoed. When she rushed to the scene, there...! Sakura is unscrupulous but excited when she unexpectedly gets involved in an incident. What kind of incident did she get involved in? Mysterious strings of characters arrive one after another... are they a code? Is it a message? The mystery-solving you've dreamed of begins now! (Source: Japanese = TV Tokyo || Translation = MyDramaList)