All nichesAI Stories

AI story video generator

Story channels are the only niche here that compounds. A facts video is consumed and forgotten; an episode of a story creates an audience that comes back for part two, and the second episode of a series routinely outperforms the first. The whole discipline is designing something that can survive being told twenty times.

That makes the constraint different from every other niche on this list. You are not optimising a single video — you are optimising a format that has to be cheap enough to produce weekly, with a shape the viewer recognises before the narrator has finished the first sentence.

What the format actually looks like

  • Length: 2 to 3 minutes per episodeEnough for a scene, a complication and a hook into the next part. The 120 and 180-second buckets are the working range; shorter than that and each episode is too thin to be worth a follow.
  • Number the episodes in the first caption"Part 4" in the opening caption does two jobs: it tells a new viewer there is a back catalogue, and it tells a returning one they are in the right place. It costs one line of the script.
  • End on a decision, not a cliffA literal cliffhanger (someone is about to be caught) burns out fast because the resolution is always a let-down. A decision — someone has just been offered something they should not accept — leaves the viewer with an opinion, and opinions get typed into comments.
  • Keep the cast small and described the same wayEvery scene image is generated from the script text, so a character described as "a tall woman in a grey coat" in every episode will look far more consistent than one described freshly each time. Two or three recurring figures is the practical ceiling.

How to make one in Castmint

This is the prompt-to-video flow: your prompt becomes a script, the script is split into scenes, an image is generated per scene, a voice reads the narration and the captions are cut to the measured timing of that recording. It all composites into one MP4 you download and own.

Settings to start from

Visual styleAnime
VoiceFable — Storyteller
Length3 minutes
Aspect ratio9:16
Music bedCinematic
Cost per video65 credits

A prompt you can paste

Episode 3 of a serialised story. A courier in a rain-soaked port city is paid to deliver a sealed box she is told never to open, and this episode is the night she finds out someone else already has. Narrated, one beat per scene, end on the decision she has to make — not on danger.

Anime is the highest-consistency style in the picker for recurring human characters — realistic styles drift more visibly between renders of the same person. Fable is literally the storyteller voice in the standard set. The cinematic bed is restrained orchestral, which is what carries a three-minute narration without fatigue. A 3-minute episode is 60 credits plus 5 for music, so a weekly series is roughly 260 credits a month — inside the Starter plan's 400.

AI Stories video questions

Can Castmint generate the episodes on a schedule?

Yes — that is what a video series is. You set a standing prompt, a length, a style, a voice and a cadence, and each run generates the next video. Series slots come with paid plans: one on Starter, two on Growth, three on Influencer, four on Ultra. Publishing stays manual — you review each episode before anything leaves the account.

How do I keep a character looking the same across episodes?

In the film pipeline, by describing them identically in every prompt — the scene images are generated from that text. If you need a genuinely fixed face, the AI Video Generator has character engines that take a reference image and place that character in a new scene. How many saved characters an account may keep depends on the plan; the current numbers are on the pricing page.

Can I write the script myself instead of prompting?

Yes. Alongside prompt-to-video there is a script-to-video path where you paste your own narration and skip the script-writing step entirely. Everything after that — scenes, voiceover, captions, render — is the same.

What does a weekly story series cost to run?

A 3-minute episode is 60 credits, or 65 with a generated music bed. Four episodes a month is about 260 credits, which fits inside Starter's 400 monthly credits with room for a few extras.

Make your first AI Stories video

Write the idea, pick the settings above, and the finished MP4 comes back a few minutes later. Every video is yours to download.

Try Castmint free

Free plan: 3 videos or 1 AI film clip, watermarked. No commitment.

Other niches

True CrimeCase-file shorts with documentary narration and dated captions.HorrorOne room, one threat, and a reveal you can hold back.MysteryRules, liminal places and endings that deliberately do not close.MotivationOne idea, thirty seconds, and a hard cut on the last word.Facts & EducationOne fact per scene, fast, with the number in the first caption.HistoryOne event, one angle, chronology as the spine.Space & ScienceScale is the hook — start small, end at something incomprehensible.Reddit StoriesA flat narrator, a moral dilemma, and a verdict at the end.LuxuryRanked countdowns where the price is the punchline.AI ASMROne object, one cut, and sound the engine generates itself.AI POVFirst-person, hands in frame, one unbroken shot.

Every plan, credit cost and limit mentioned on this page is on the pricing page, and the pipeline itself is described in full on what Castmint does.