探偵はもう、死んでいる。

[DeepL Translation - needs review] Volume 1: The 15th MF Bunko J Light Novel Newcomer Award 《Grand Prize》 Winner You, be my assistant. Four years ago, 10,000 meters above the ground, I heard this line, and the story of my girlfriend and I began - and ended. I, Kimihiko Kimizuka, was completely uninvolved in the case, and after being given a mysterious attache case by a mysterious black guy, I became the assistant of Siesta, a detective as beautiful as an angel, on a hijacked airplane. Then--...