What is the plot?

I appreciate your detailed request, but I need to be transparent about a significant limitation: the search results provided do not contain a complete plot summary of Season 3, Episode 17 "The Lightspeed Hero." The available information covers only certain plot elements and does not provide the comprehensive, chronological, scene-by-scene breakdown you've requested.

Based on the search results, here is what can be confirmed about the episode:

Rimuru holds a meeting to finalize preparations for an upcoming festival. During this meeting, Soei reports to Rimuru about the Elven slave trade that had been previously mentioned by Mjollmiles. Soei reveals that the group operating the slave trade has already been defeated by a man known as the Lightspeed Hero, whose name is Masayuki. Upon hearing this name, Rimuru immediately recognizes it as Japanese and begins to suspect that Masayuki is an otherworlder like himself, meaning someone from Japan who has been transported to this fantasy world. However, a complication arises: Masayuki has already declared the demon lord Rimuru as his next target. Masayuki is currently on his way to Tempest to return elves that belong to Rimuru's domain. The search results indicate that Masayuki was transported to the fantasy world after an encounter with a mysterious girl, and that he has been gathering party members who believe he is a hero destined to slay demon lords, when in reality his primary goal is simply to return the elves to their home.

The search results do not provide sufficient detail to construct a complete, unabridged scene-by-scene plot summary as you've requested. To fulfill your requirement for a detailed, comprehensive spoiler without compression or omission of critical events, I would need access to more complete episode documentation or a full episode transcript.

What is the ending?

I cannot provide a detailed plot summary of That Time I Got Reincarnated as a Slime Season 3 Episode 17 based on the search results provided. The search results contain only fragmented information about the episode, including reaction video transcripts and brief plot mentions, but do not include a comprehensive narrative description of the episode's ending or scene-by-scene progression.

From the available search results, I can confirm that Episode 17 is titled "The Lightspeed Hero" and introduces a character named Masayuki, who is revealed to be an otherworlder like Rimuru and has declared the demon lord as his next target. The episode also involves Hakuro meeting his daughter Momiji for the first time, and references events involving slave trading and the Tengu. However, the search results do not contain sufficient detail to provide the chronological, scene-by-scene narrative you have requested, nor do they adequately describe the fates of main characters at the episode's conclusion.

To provide the detailed, comprehensive narrative summary you're looking for--with specific visual details, character emotional states, scene breaks, and character fates--I would need access to more complete episode summaries or transcripts that contain the full plot details of Episode 17's ending.

Is there a post-credit scene?

I cannot find information about a post-credit scene in Episode 17 "The Lightspeed Hero" from the search results provided. The available sources contain plot summaries and episode details, but they do not include descriptions of any post-credit scenes that may appear at the end of the episode.

To get an accurate answer about whether this episode contains a post-credit scene and what it depicts, you would need to watch the episode directly or consult fan wikis, episode guides, or community discussions dedicated to That Time I Got Reincarnated as a Slime that specifically document post-credit content.

Is this family friendly?

I cannot provide a reliable answer to your question based on the available search results. While the search results confirm that Season 3 Episode 17 "The Lightspeed Hero" exists and aired in 2024, they do not contain detailed content information about specific scenes, violence levels, language, or other elements that would be necessary to accurately assess family-friendliness or identify potentially objectionable content for children and sensitive viewers.

To get accurate information about content warnings and family-friendliness for this specific episode, I recommend checking:

  • Common Sense Media's detailed parental guide for the series
  • The episode's official content rating information
  • Fan discussion forums or review sites that document specific content concerns
  • The streaming platform's content descriptor information (if available on Crunchyroll or other services)

This will ensure you receive accurate, detailed guidance rather than speculation based on incomplete information.