Detective Is Already Dead concludes the first season with an epic finale that ties in with many intriguing endings, but also establishes the plot for Season 2.
Detective is dead aka Tantei wa Mou Shindeiru end the first season with the epic return of the iconic heroine, Siesta, in a rather unconventional way. Not only does Siesta’s consciousness temporarily take control of Nagisa Natsunagi’s body to help defeat Chameleon, but Season 1 also ties together every character story starting with Volume 1. Key revelations in the final season are also possible. future plot setting for Season 2.
One of the main storylines that emerged during the season finale involved Nagisa Natsunagi and her connection to Siesta. Since episode 2 of the anime, Nagisa has occupied the role previously played by the deceased ace detective. In Nagisa’s own words, continuing Siesta’s work is her way of honoring her legacy and the new life she has been given, thanks to Siesta for donating her heart.
Of course, it was only a matter of time before Siesta’s old nemesis, Kimihiko Kimizuka, brought the two together and realized that Nagisa was actually another alter ego of Hel. Despite being Siesta’s arch-nemesis, there’s a lot Kimihiko doesn’t seem to know about Hel, Nagisa, and even Siesta. For starters, he doesn’t seem to know that Siesta plays a larger role in facilitating Nagisa’s identity now that her heart is inside Hel’s body; quite an important revelation.
Sometime after Kimihiko lost consciousness after her battle with Hel a year ago, Siesta revealed that she didn’t really intend to die, but would “wake up” as Nagisa Natsunagi. She also accepts that she is dead and confirms in the present that she has no plans to take over Nagisa’s body, explaining that she is passing her legacy on to Nagisa, Kimihiko, Yui Saikawa and Charlotte Arisaka Anderson (aka Charl). Her last wish is for the four of them to work together as a team and create SPES. This was also the condition she offered to Nagisa when the latter temporarily allowed her to take over her body in order to save Kimihiko from Chameleon.
There’s a lot to unpack about Siesta’s relationship with Nagisa, starting with the fact that she seems to know more about Nagisa than she lets on. This ability is especially powerful when taking into account that Siesta doesn’t want to die, but still decides to accept his fate and pass on his legacy to Nagisa specifically. This is an event where the original Siesta sacrificed herself to save Alicia from her villainous self. It seems to imply that Siesta may have always known about Nagisa’s identity.
If Nagisa is not a new identity that Siesta developed after “fusion” with Hel, then similarly, Nagisa may have met Siesta at some point in her past. However, as someone living with Dissociative Identity Disorder, she was unaware of this. On that note, Hel implies back in Episode 6 that she knows quite a bit about Siesta as well, implying that they have a shared history. This seems to further hint at a possible connection to Nagisa – a potential storyline that could be explored in Season 2.
Another major storyline that ended at the end of the season was the unresolved romance between Siesta and Kimihiko, both of whom admitted their feelings for each other on the battlefield a year earlier. During the conversation, they specifically revisited a time they drank together in London, leading to a one-night stand that neither of them wanted to remember. Kimihiko specifically denied engaging in a drunken relationship with Siesta, most likely an act of self-protection without explicit consent.
Siesta neither confirmed nor denied the one-night stand, but she confirmed that – at least once – she would consider making love to him. This not only confirms Siesta’s feelings for Kimihiko are romantic, but also that she has the ability to act on those feelings when her inhibitions drop. That’s exactly what happened in London the year before when Siesta – under the influence – invited Kimihiko into her bed, setting the stage for the chain of events that led her to initiate a relationship. Given the importance of the bedroom scene at this point, it’s likely that the one-night stand will be revisited in Season 2.