"Tantei wa Mou, Shinde Iru." but this is a romantic comedy manga.

Hiro Nomura, a novelist with an enormous fortune, is getting old and is considering moving into a nursing home. Should he "prepare for the end" and enjoy a peaceful life, or should he continue writing stories? A refreshing story of preparatory work begins! (Source: Shonen Jump Plus, Translated)

Volume 1: White Garden (ホワイト・ガーデン, The White Garden) 1. **KIND MACHINE** (カインド・マシン, KIND MACHINE) 2. **Tsuki no Neko** (月の猫, Moon Cat) 3. **Simulation** (シミユレイシヨン, Simulation) 4. **Itsu Made mo Kimi no Kokoro ni** (いつまでも君の心に, I'm Everywhere) 5. **Hane no Aru Uma** (翅のある馬, Winged Horse) 6. **Frankenstein wa Boku ni Yutta** (フランケンシュタインは僕に云った, The Dead Man Told Me) 7. **Hoshi wo Nokoshite** (星を残して, The Star) 8. **White Garden** (ホワイト・ガーデン, The White Garden) Volume 2: Ao mata Ao (青また青, Blue and Blue) 1. **Ao mata Ao** (青また青, Blue and Blue) 2. **2821 COCA COLA** (2821コカコーラ, 2821 COCA COLA)

Volumes 1. **Kou no Shiro** (コーの白, Sanctuary) 2. **Ruby Black** (ルビー・ブラック, Ruby Black) 3. **Ouinaru Kami no Te** (大いなる神の手, Great God Hands) 4-5. **Kakuu no Sen** (架空の線, The Border)