(Shiteki) Tantei Monogatari

Rudy works as an undercover detective, primarily focused on monitoring a noble. As children, he became Elise's "detective," believing that role meant being dependable. Elise now frequently asks for his help, mostly to investigate Albert, Rudy’s older brother. Albert is handsome, talented, and rich, attracting many admirers, including Elise. However, there are whispers about the wealthy family's eldest son engaging in secret nighttime activities. Albert appears to be concealing something, and Rudy is determined to uncover the truth.