Masumi Sera is a recurring character in Meitantei Conan (Detective Conan), known as a sharp-witted high school student and skilled martial artist. She is observant, confident, and often helps drive the mystery-solving aspects of the series by noticing details others miss. Masumi is also connected to several important storylines involving Conan, her family, and larger overarching secrets in the series. Her role is that of an ally, investigator, and occasional rival in deduction.