The Apothecary Diaries Is Getting a Video Game, and Its Author Wrote the Mystery Herself

The Apothecary Diaries has spent three seasons proving that court intrigue and pharmacology make an unreasonably good pairing. Now Koei Tecmo wants to prove it works as a game too. During Nintendo's September 9 Direct, the publisher revealed The Apothecary Diaries: The False Imperial Brother, the franchise's first console game, and the detail that actually matters is buried in the credits: series author Natsu Hyuga is listed for the original concept, and the mystery at the center of it has never appeared in the novels, manga, or anime.

What The False Imperial Brother actually is

The game is a mystery-adventure built around Maomao, the same sharp-tongued apothecary who has spent the anime diagnosing poisonings and unraveling harem politics one herbal remedy at a time. According to Koei Tecmo, the plot is a completely new story rather than a retelling of an arc fans already know, centered on a fabricated claim to imperial lineage that Maomao has to pick apart using the same tools she always has: observation, chemistry, and an allergy to keeping her mouth shut.

Mechanically, the game leans into that identity instead of forcing Maomao into a genre she was never built for. Koei Tecmo has described the gameplay loop as exploring locations, collecting physical evidence, crafting medicine from gathered ingredients, and organizing what you find into a case before making a deduction. That is a deliberate departure from the studio's usual output. This is the team behind the Dynasty Warriors and Nioh franchises, and instead of turning Maomao into a hack-and-slash protagonist, they built something closer to a slower, more procedural detective game. It is the correct instinct. The Apothecary Diaries has never been an action property, and a game that tried to make it one would have missed the entire point of the source material.

The author writing it herself is the real headline

Plenty of anime get tie-in games. Most of them are licensed reskins where the original creator signs off on a logo and nothing else. Natsu Hyuga is credited with supplying the original concept for The False Imperial Brother's story, which puts this closer to a canonical side story than a cash-in. That distinction matters for a franchise built almost entirely on the reader trusting that every clue placed in front of them is fair. A generic mystery slapped onto Maomao's face would have been noticeable immediately, because the entire appeal of this franchise is that Hyuga plays fair with her puzzles. Handing her the pen for a new one is the only way to make a video game version feel like it belongs in the same universe rather than borrowing it.

It also suggests Koei Tecmo is treating this as more than a marketing tie-in timed to Season 3's return. Games built from an author's own new material take real lead time, and early 2027 for a title revealed in September 2026 is a tight window that implies development has been underway for a while, likely since well before this month's Direct.

The timing is not a coincidence

The Apothecary Diaries Season 3 premieres October 2, 2026, which puts this announcement roughly three weeks ahead of the anime's return to Japanese broadcast. That is the kind of scheduling a publisher does on purpose. Koei Tecmo is following the reveal with a dedicated Tokyo Game Show stage on September 20, right in the middle of the show's public days, with three of the anime's Japanese cast members confirmed to appear: Aoi Yuki as Maomao, Takeo Otsuka as Jinshi, and Yohei Azakami. Having the actual anime cast reprise their roles for the game, rather than recasting for a separate media property, is another signal that Koei Tecmo wants this to read as an extension of the story people already know, not a spinoff running on a parallel track with its own rules.

What we still don't know

Koei Tecmo has confirmed the platforms, the early 2027 window, and the broad gameplay pillars, but a full release date, pricing, and a first gameplay trailer are still pending. The TGS stage on September 20 is the obvious place to expect at least some of that, alongside likely footage of the crafting and deduction systems in motion. The game will ship with Japanese voice acting and English text at launch, which tracks with how Koei Tecmo has localized several of its other properties and means English-speaking fans will not need to wait for a separate dub pass before they can play it.

The bigger question is how deep the mystery goes. A single case built around one fabricated claim to the throne could be a tight five-to-eight-hour experience, or it could be the framing device for a longer game with multiple smaller mysteries along the way, closer in structure to how the anime handles its own episodic poisonings inside a larger seasonal arc. Nothing announced so far settles that either way.

What is clear is that this is the rare licensed game built with the actual author in the room, timed to land while the anime is at its highest visibility in years. If Koei Tecmo's deduction systems land half as well as Hyuga's writing usually does, The False Imperial Brother has a real shot at being one of the better anime tie-in games in recent memory instead of another one nobody remembers a year later.