Description:

A locked room, all suspects with alibis - Gotemba Toori is a curly-haired man who specializes in investigating "impossible" crimes. Dying messages, strange items left behind - Katamushi Hisame is a man in a suit who specializes in solving "inexplicable" cases. The two partners, but rivals (?), run a detective agency called "Knockin' on a Locked Door," and today, another strange request comes pouring in... A double detective story brought to you by a new generation of serious mystery writers begins! (Source: Amazon JP | Translated)

Alternative Titles:

ノッキンオン・ロックドドア, Knockin' on Locked Door