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The second act is about to begin. The adventure of the detective and her assistant began ten thousand meters above the earth. They helped clients, solved cases, fought powerful enemies, and traveled all over the world—and then the detective died. The story should have ended there. But a year later, one girl’s passion set it in motion again. After many battles and sacrifices, a miracle was granted. Now that it’s all over, Kimihiko Kimizuka is basking in the ordinary life that comes afterward. (Am I okay with that, you ask? Sure. It’s not like I’m causing trouble for anybody. I mean, it’s true, isn’t it? The detective is already—)

“Let’s go on a journey to unlock the world’s secrets.”Kimihiko Kimizuka was once the assistant to two Ace Detectives, and after achieving a miracle, the sequel to the story was ordinary life. The Ritual of Sacred Return was supposed to be the moment world peace was achieved—but instead, it was discovered that something was wrong with the memories of the world. As the search for the truth begins, it seems Kimihiko’s memories of his brief but extraordinary adventure with another Tuner, Rill, may hold the key…

The Detective Is Already Dead is a compelling light novel series combining a few beloved genres—one of the most highly-anticipated light novel series from the fanbase.

All I wanted was to be a regular highschooler, and that wish is why I'm here right now. My name is Nagisa Natsunagi, and I'm just a high school girl, nothing more-not yet anyway. If there's one thing that's different about me, it's that, up until recently, I was too sick to come to school. Miraculously, I received a new heart, and the surgery was successful. Now I'm finally living the life I always wanted! But I can't help wondering about my donor...I hear there's a boy in town who can solve any case. Maybe he can help me?

With the world in peril once again, I, Kimihiko Kimizuka, returned to my role as the Ace Detective’s assistant and set out on a journey to recover the lost memories of humanity. Following a trail of leads and using the Sacred Relic discovered by the Oracle, we sought to investigate a crisis from a certain world in the past, and the Vampire Scarlet was at the center of it. But the deeper we delved, even the harrowing truths that were once beyond our reach began to bubble to the surface. This is the story of detectives who continued to pursue the mysteries that remain hidden from the world—and the story of a Vampire King who defied the injustices of the world and fought ’til the very end.

When the story begins without its hero​Kimihiko Kimizuka has always been a magnet for trouble and intrigue. For as long as he can remember, he’s been stumbling across murder scenes or receiving mysterious attache cases to transport. When he met Siesta, a brilliant detective fighting a secret war against an organization of pseudohumans, he couldn’t resist the call to become her assistant and join her on an epic journey across the world. …Until a year ago, that is. Now he’s returned to a life that is normal and tepid by comparison, knowing the adventure must be over. After all, the detective is already dead.

WHO WERE YOU TO HER? WHO WAS SHE TO YOU?​While on an outing one day, Kimihiko Kimizuka and his three friends are kidnapped by…Siesta herself?! But they soon learn there’s more to the story as she reveals the long-forgotten truth about Siesta’s death. Will this be the clue that finally unlocks the secrets of Kimihiko's past?

What’s wrong with this story? After being kidnapped, Kimizuka, Natsunagi, Saikawa, and Charlie have learned the truth about Siesta’s death...or have they? A girl who looks just like the deceased appears and informs them that the footage they’ve been investigating contains an error. As they hunt for an answer to a mystery that even Siesta couldn’t uncover, the group will learn what it truly means to inherit the legacy of an ace detective. Though the detective may already be dead and the truth of her passing revealed, it’s still too early for the epilogue…

The dead detective and her assistant come to life in this manga adaptaion! I, Kimihiko Kimizuka, was an ordinary high school student. Sure, I had a penchant for getting dragged into all sorts of trouble, but was otherwise ordinary-until I met her. The detective, Siesta. Her angelically beautiful face and cool disposition in the face of plane hijackers swept me off my feet…and the next thing I knew, I’d spent the next three years off on a whirlwind adventure acting as her assistant. After all, I was the Watson to her Sherlock. But then…she died. It didn’t end there, though. No, our story only really began a year later when I met a bratty, snotty high school girl who seemed oddly familiar…

I just knew it. When I, Kimihiko Kimizuka, agreed to help Nagisa Natsunagi find her heart donor, I should’ve realized I was being dragged into something troublesome. Actually, I had an eerily similar feeling four years ago when I met Siesta on that plane. Speaking of which, that was where I first met the old jailbird Bat. I brought Natsunagi to him, hoping he’d be able to identify her donor-but I never expected him to bring up that name again… And so, having solved my last case, it was time for me to return to my ordinary high school life-or so I thought. But apparently, Natsunagi still has business with me…What kind of trouble will she drag me into next? Family heirlooms? Spoiled idols?

Due to my penchant for getting dragged into things, I, Kimihiko Kimizuka, an ordinary high-school student, suddenly was asked to protect national idol Yui Saikawa's Three-billion-yen sapphire!? When there's a detective, there's always a case, and so, another case begins for me and Siesta’s heart’s recipient, Nagisa Natsunagi!

Once the assistant to a great detective, Kimihiko Kimizuka took on a challenge Siesta bequeathed to him after her death and arrived at a conclusion that surpassed his wildest expectations. To bring back the great detective—the stuff of miracles—Kimihiko and Natsunagi fly to London yet again to obtain evidence that can bring down Seed. On the flight there, however, he hears the same words as he did four years ago: “Is there a detective on the plane?”

Reunited with Siesta, Kimihiko is pulled back into action as assistant to the Ace Detective. Together, the two face off against Seed again and, with a little extra help, defeat him. Although that particular crisis may be over, the journey to awaken Natsunagi continues. In search of clues for how to save her, Siesta and Kimihiko travel to New York City. However, instead of answers, they find trouble brewing with the Phantom Thief—and worst of all, Siesta disappears!

To celebrate a job well done, I, Kimihiko Kimizuka, have set out on a cruise with the ace detective, Nagisa Natsunagi, and our new ally, Yui Saikawa. However, a detective’s work is never done—not even a dead one’s…For it seems that somewhere, on this very ship, Siesta’s legacy is hidden.We didn’t have the slightest inkling it existed until we got a tip from Siesta’s biggest fan, Charlotte Arisaka Anderson. But no matter how important Siesta is to her, she seems reluctant to help our team in the search. She must still be angry about my year of inactivity. Just what does she want from me? I was only ever the assistant!Unfortunately, we’re not the only ones looking for Siesta’s legacy. After all, we’re competing with S.P.E.S. and, worse yet, a pseudo-human even Siesta couldn’t beat!! He’ll stop at nothing to get his hands on it...

Siesta and Kimihiko’s first meeting did not take place during that fateful plane hijacking but rather four years earlier, when the Federation Government tasked Siesta with locating a spy in Japan. During her undercover investigation, she happened upon her future assistant, who had a connection with the spy she was looking for. With Kimihiko as her only lead, she enlisted his help in the search. But Siesta hid her identity with constant disguises, so unbeknownst to Kimihiko, he had already met the Ace Detective. Finally, the story of their true encounter—and the reason behind Siesta’s invitation to Kimihiko on that day in the sky—is revealed in this prequel!

“Now we know what we’re up against…!” With a little help from Charlotte Arisaka Anderson and a surprise appearance by the late detective herself, I, Kimihiko Kimizuka, was able to defeat the devious pseudohuman Chameleon who attacked us during our cruise ship investigation. That doesn’t mean the end of our excitement aboard the ship, though, because right after cleaning up that mess, Charlie, Yui, Nagisa, and I were summoned to…learn the truth about Siesta’s death?! Not only that, but it turns out Nagisa has some bigger shoes to fill than we thought…What exactly was the ace detective wrapped up in before her untimely demise?!