[DeepL Translation - needs review] Introduction to Volume 1: Reina Sasaki, a beautiful girl who never smiles, joins Suma PI School, a detective school affiliated with Suma Research, an investigation company. Reina wants to know everything about detectives, but does not want to be a detective. Yasuomi Suma, the president of Suma Research, discovers her surprising past. Suma takes Reina's wishes into consideration and sets up a "detective section. Reina Sasaki becomes a "detective of the detec...
