Synopsis

Driven by curiosity, the Detective Boys embarked on a mountain expedition to visit an old acquaintance of Agasa. Their mission: to collect a few beetles for school. Under the cloak of night, they succeeded in gathering a plentiful number. However, their return brought a somber discovery – Namatame lay injured. His final words, uttered as he slipped unconsciousness, were a single, significant phrase: "Miyama Stag Beetle."