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
S1 (Movie)SUMMER 2026MOVIE
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
Aug 31, 2026, 03:37 AM
Franchise overview
Franchise timeline
Review every Courcast-tracked season for this series and jump between entries.
Renewal pulse
Courcast score breakdown
CourScore is the probability of an official sequel announcement within 18 months, blending attention velocity, completion strength, and catalogue health.
CourScore
54.7
CourScore is the probability of an official sequel announcement within 18 months.
Signal coverage: 100% • Signal freshness: High • Updated 12 days ago
Top reasons
- Source runway - Source material runway assessed as 'ok'
- Cross-platform audience rating - Weighted audience rating 80.9
- Trailer reception (YouTube) - Official trailer has 4,851,613 views
Runway
Ok
Source runway looks healthy for a continuation.
Financial & Commercial50
Production Feasibility61
Audience Reception65
Strategic Priors40
Fandom Engagement50
CourScore history
CourScore over time
Last analysedAug 31, 2026, 03:37 AM
Next scheduled11 days 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 55% renewal probability. 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 55 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. Titles scoring above 70 are considered Very Likely to receive a continuation.
- What is Chiikawa: Ningyo no Shima no Himitsu's renewal probability?
- Chiikawa: Ningyo no Shima no Himitsu's CourScore is 55 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-updated probability out of 100.
Latest signals
Fresh telemetry
Courcast watches every connected signal to surface the freshest indicators of momentum.
| Source | Metric | Geo | Value | Collected |
|---|---|---|---|---|
| anilist | average score | GLOBAL | 71 | Aug 29, 2026, 12:00 AM |
| anilist | favorites | GLOBAL | 47 | Aug 29, 2026, 12:00 AM |
| anilist | popularity | GLOBAL | 2,358 | Aug 29, 2026, 12:00 AM |
| anilist | trending | GLOBAL | 1 | Aug 29, 2026, 12:00 AM |
| animate | merch rank | JP | 15 | Aug 18, 2026, 12:00 AM |
| crunchyroll | episode count | GLOBAL | 12 | Sep 11, 2026, 12:00 AM |
| crunchyroll | episode dislikes | GLOBAL | 132 | Sep 11, 2026, 12:00 AM |
| crunchyroll | episode likes | GLOBAL | 4,651 | Sep 11, 2026, 12:00 AM |
| crunchyroll | series available | GLOBAL | 1 | Sep 11, 2026, 12:00 AM |
| filmarks | mark count | JP | 7,152 | Sep 11, 2026, 12:00 AM |
| filmarks | score mean | JP | 88 | Sep 11, 2026, 12:00 AM |
| google trends | interest daily | GLOBAL | 24 | Sep 10, 2026, 12:00 AM |
| google trends | interest weekly | GLOBAL | 100 | Aug 30, 2026, 12:00 AM |
| kitsu | favorites | GLOBAL | 12 | Jun 22, 2026, 12:00 AM |
| kitsu | member count | GLOBAL | 28 | Sep 11, 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 | 716 | Sep 11, 2026, 12:00 AM |
| mal | members | GLOBAL | 3,460 | Sep 11, 2026, 12:00 AM |
| mal | plan to watch | GLOBAL | 2,611 | Sep 11, 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 | 70 | Sep 11, 2026, 12:00 AM |
| mangaupdates | bayesian rating | GLOBAL | 6.47 | Sep 10, 2026, 12:00 AM |
| niconico | episode comments | JP | 3,077 | Sep 11, 2026, 12:00 AM |
| niconico | episode mylists | JP | 1,679 | Sep 11, 2026, 12:00 AM |
| niconico | episode views | JP | 390,972 | Sep 11, 2026, 12:00 AM |
| niconico | premiere comment velocity | JP | 0.26 | Sep 11, 2026, 12:00 AM |
| comments 7d | GLOBAL | 91 | Sep 11, 2026, 12:00 AM | |
| mentions 1d | GLOBAL | 1 | Aug 9, 2026, 12:00 AM | |
| mentions 7d | GLOBAL | 3 | Sep 11, 2026, 12:00 AM | |
| score 7d | GLOBAL | 116 | Sep 11, 2026, 12:00 AM | |
| thread count | GLOBAL | 3 | Sep 11, 2026, 12:00 AM | |
| threads 7d | GLOBAL | 3 | Sep 11, 2026, 12:00 AM | |
| shikimori | completion ratio | GLOBAL | 0.03 | Sep 11, 2026, 12:00 AM |
| shikimori | member count | GLOBAL | 404 | Sep 11, 2026, 12:00 AM |
| shikimori | score mean | GLOBAL | 79 | Sep 11, 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 | 107 | Aug 26, 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 | 61,668 | Sep 11, 2026, 12:00 AM |
| youtube | trailer views | GLOBAL | 5,575,899 | Sep 11, 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 |