Aliases
Chiikawa the Movie: The Secret of Mermaid Island, ちいかわ セイレーン編, Chiikawa: Siren Arc, Chiikawa: Ningyo no Shima no Himitsu, 映画ちいかわ 人魚の島のひみつ, Chiikawa Movie: Ningyo no Shima no Himitsu, Chiikawa Movie: The Secret of the Mermaid Island, 劇場版 CHIIKAWA 人魚島的秘密
SUMMER 2026MOVIE
Branch
Part of this franchise
concluded
Announced
In production
Releasing
Completed
Based on a series of Chiikawa comics posted on X by Nagano from March to November 2023, known as the "Siren Arc".
One day, while Chiikawa and Hachiware were relaxing in the square, Usagi suddenly appeared with a flyer stuck to its face. When Hachiware checked the flyer, it was an invitation reading “Special Invitation to a Special Island.”
Lured by promises like “Get 100x rewards for simple island quests!” and “Limited-edition island ramen, exclusive sweets—sweet and spicy treats all practically free!”, Chiikawa and the others decided to go on the island retreat. Boarding the ship alongside Rakko, who was suspicious of the flyer's contents, the group landed on the island... only to find something waiting for them there...!?
(Source: Official Site, translated)
One day, while Chiikawa and Hachiware were relaxing in the square, Usagi suddenly appeared with a flyer stuck to its face. When Hachiware checked the flyer, it was an invitation reading “Special Invitation to a Special Island.”
Lured by promises like “Get 100x rewards for simple island quests!” and “Limited-edition island ramen, exclusive sweets—sweet and spicy treats all practically free!”, Chiikawa and the others decided to go on the island retreat. Boarding the ship alongside Rakko, who was suspicious of the flyer's contents, the group landed on the island... only to find something waiting for them there...!?
(Source: Official Site, translated)
Last updated
Oct 28, 2026, 06:20 AM
Franchise overview
Franchise timeline
Review every Courcast-tracked season for this series and jump between entries.
Renewal pulse
Courcast score breakdown
CourScore weighs signals for an official sequel announcement within 18 months, blending attention velocity, completion strength, and catalogue health.
CourScore
60.8
CourScore measures renewal signals out of 100. It is not a calibrated probability of an official sequel announcement within 18 months.
Signal coverage: 100% • Signal freshness: High • Updated 13 hours ago
Top reasons
- Cross-platform audience rating - Weighted audience rating 84.6
- Source runway - Source material runway assessed as 'ok'
- Trailer reception (YouTube) - Official trailer has 7,079,514 views
Runway
Ok
Source runway looks healthy for a continuation.
Financial & Commercial54
Production Feasibility73
Audience Reception72
Strategic Priors43
Fandom Engagement56
CourScore history
CourScore over time
Last analysedOct 28, 2026, 06:20 AM
Next scheduled7 hours ago
Renewal FAQ
Chiikawa: Ningyo no Shima no Himitsu renewal questions
Common questions about this title's renewal prospects, answered by Courcast's daily analysis.
- Is Chiikawa: Ningyo no Shima no Himitsu getting a new season?
- According to Courcast's latest analysis, Chiikawa: Ningyo no Shima no Himitsu has a 61/100 renewal signal score. This score is updated daily and blends fandom momentum, streaming signals, source-material runway, and franchise history. Check back regularly for the latest forecast.
- Will Chiikawa: Ningyo no Shima no Himitsu be renewed?
- Chiikawa: Ningyo no Shima no Himitsu currently scores 61 out of 100 on Courcast. Signals driving this estimate include online discussion volume, sequel history within the franchise, and platform engagement data - all recalculated daily. Scores from 70 indicate strong renewal signals; scores from 85 are labelled very likely.
- What is Chiikawa: Ningyo no Shima no Himitsu's renewal probability?
- Chiikawa: Ningyo no Shima no Himitsu's CourScore is 61 as of the latest update. CourScore is Courcast's proprietary metric that aggregates over a dozen renewal signals - from source-material runway to social buzz - into a single daily signal score out of 100.
Latest signals
Fresh telemetry
Courcast watches every connected signal to surface the freshest indicators of momentum.
| Source | Metric | Geo | Value | Collected |
|---|---|---|---|---|
| abema | streaming rank | JP | 23 | Oct 7, 2026, 12:00 AM |
| anilist | average score | GLOBAL | 81 | Oct 27, 2026, 12:00 AM |
| anilist | favorites | GLOBAL | 97 | Oct 27, 2026, 12:00 AM |
| anilist | popularity | GLOBAL | 3,208 | Oct 27, 2026, 12:00 AM |
| anilist | trending | GLOBAL | 2 | Oct 27, 2026, 12:00 AM |
| animate | merch rank | JP | 15 | Aug 18, 2026, 12:00 AM |
| crunchyroll | episode count | GLOBAL | 12 | Sep 25, 2026, 12:00 AM |
| crunchyroll | episode dislikes | GLOBAL | 133 | Sep 25, 2026, 12:00 AM |
| crunchyroll | episode likes | GLOBAL | 4,685 | Sep 25, 2026, 12:00 AM |
| crunchyroll | series available | GLOBAL | 1 | Sep 25, 2026, 12:00 AM |
| filmarks | mark count | JP | 8,214 | Oct 27, 2026, 12:00 AM |
| filmarks | score mean | JP | 88 | Oct 27, 2026, 12:00 AM |
| google trends | interest daily | GLOBAL | 0 | Oct 20, 2026, 12:00 AM |
| google trends | interest weekly | GLOBAL | 0 | Oct 18, 2026, 12:00 AM |
| google trends | momentum log ratio | GLOBAL | 0 | Oct 18, 2026, 12:00 AM |
| kitsu | favorites | GLOBAL | 12 | Jun 22, 2026, 12:00 AM |
| kitsu | member count | GLOBAL | 41 | Oct 27, 2026, 12:00 AM |
| kitsu | rating rank | GLOBAL | 559 | Jun 22, 2026, 12:00 AM |
| kitsu | score mean | GLOBAL | 81.22 | Jun 22, 2026, 12:00 AM |
| mal | chapters total | GLOBAL | 73 | Aug 27, 2026, 12:00 AM |
| mal | completed | GLOBAL | 1,451 | Oct 27, 2026, 12:00 AM |
| mal | members | GLOBAL | 4,525 | Oct 27, 2026, 12:00 AM |
| mal | plan to watch | GLOBAL | 2,861 | Oct 27, 2026, 12:00 AM |
| mal | rating | GLOBAL | 7.6 | Aug 27, 2026, 12:00 AM |
| mal | source members | GLOBAL | 9,937 | Aug 27, 2026, 12:00 AM |
| mal | source status code | GLOBAL | 3 | Aug 27, 2026, 12:00 AM |
| mal | volumes total | GLOBAL | 15 | Aug 27, 2026, 12:00 AM |
| mal | watching | GLOBAL | 113 | Oct 27, 2026, 12:00 AM |
| mangaupdates | bayesian rating | GLOBAL | 6.47 | Oct 26, 2026, 12:00 AM |
| niconico | episode comments | JP | 4,542 | Oct 27, 2026, 12:00 AM |
| niconico | episode mylists | JP | 1,216 | Oct 27, 2026, 12:00 AM |
| niconico | episode views | JP | 367,911 | Oct 27, 2026, 12:00 AM |
| niconico | premiere comment velocity | JP | 0.09 | Sep 29, 2026, 12:00 AM |
| comments 7d | GLOBAL | 46 | Oct 27, 2026, 12:00 AM | |
| mentions 1d | GLOBAL | 1 | Oct 17, 2026, 12:00 AM | |
| mentions 7d | GLOBAL | 1 | Oct 27, 2026, 12:00 AM | |
| score 7d | GLOBAL | 130 | Oct 27, 2026, 12:00 AM | |
| thread count | GLOBAL | 1 | Oct 27, 2026, 12:00 AM | |
| threads 7d | GLOBAL | 1 | Oct 27, 2026, 12:00 AM | |
| shikimori | completion ratio | GLOBAL | 0.09 | Oct 27, 2026, 12:00 AM |
| shikimori | member count | GLOBAL | 470 | Oct 27, 2026, 12:00 AM |
| shikimori | score mean | GLOBAL | 81.3 | Oct 27, 2026, 12:00 AM |
| simkl | score mean | GLOBAL | 86 | Oct 23, 2026, 12:00 AM |
| tmdb | popularity | GLOBAL | 22.29 | Feb 26, 2026, 12:00 AM |
| tmdb | vote count | GLOBAL | 3 | Feb 26, 2026, 12:00 AM |
| wikipedia | pageviews daily | EN.WIKIPEDIA | 38 | Oct 27, 2026, 12:00 AM |
| x official jp | posts 7d | JP | 18 | Aug 16, 2026, 12:00 AM |
| x official jp | silent days | JP | 0 | Aug 16, 2026, 12:00 AM |
| youtube | channel views total | GLOBAL | 0 | Jun 29, 2026, 12:00 AM |
| youtube | subscribers total | GLOBAL | 0 | Jun 29, 2026, 12:00 AM |
| youtube | trailer likes | GLOBAL | 66,741 | Oct 27, 2026, 12:00 AM |
| youtube | trailer views | GLOBAL | 7,079,514 | Oct 27, 2026, 12:00 AM |
| youtube | uploads 30d | GLOBAL | 25 | Jun 29, 2026, 12:00 AM |
| youtube | uploads 7d | GLOBAL | 25 | Jun 29, 2026, 12:00 AM |
| youtube | views 30d | GLOBAL | 20,721 | Jun 29, 2026, 12:00 AM |
| youtube | views 7d | GLOBAL | 20,721 | Jun 29, 2026, 12:00 AM |