Silvia Kobu serves as a classmate and close friend to Hime Goto, completing a trio with Riko Kitsuchi and Hina Tomi that dubs itself the "loli detectives" due to their shared enthusiasm for lighthearted sleuthing. During an investigation into a local hero who rescued a drowning cat—whom the group mistakenly believes holds significance—Silvia identifies the distinctive floatation device used in the rescue. This clue prompts them to trail the individual to a nearby spot. Their pursuit inadvertently creates a misunderstanding that the hero visits an exclusive venue, though it is merely a coffee chain. In an attempt to distract their target, the trio offers manga for entertainment, unknowingly selecting a work by Kakushi Goto. This action preserves the secrecy of Kakushi’s profession as Hime’s father. Silvia’s visual design bears resemblance to Abiru Kobushi from *Sayonara Zetsubou Sensei*, a connection reinforced by her Romaji name, Kobu Shirubia.