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
Jul 28, 2026, 06:01 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
49.5
CourScore is the probability of an official sequel announcement within 18 months.
Signal coverage: 100% • Signal freshness: High • Updated 6 hours ago
Top reasons
- Source runway - Source material runway assessed as 'ok'
- Crunchyroll Like Index - 4,564 likes / 4,692 reactions on recent episodes
- Key staff availability - Director Masanori Tsuchiya has no other concurrent active productions
Runway
Ok
Source runway looks healthy for a continuation.
Financial & Commercial49
Production Feasibility61
Audience Reception43
Strategic Priors46
Fandom Engagement40
CourScore history
CourScore over time
Last analysedJul 28, 2026, 06:01 AM
Next scheduledin 18 hours
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 49% 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 49 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 49 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 |
|---|---|---|---|---|
| filmarks | mark count | JP | 5,545 | Jul 27, 2026, 12:00 AM |
| crunchyroll | episode likes | GLOBAL | 4,564 | Jul 27, 2026, 12:00 AM |
| niconico | episode comments | JP | 64 | Jul 27, 2026, 12:00 AM |
| wikipedia | pageviews daily | EN.WIKIPEDIA | 10 | Jun 13, 2026, 12:00 AM |
| crunchyroll | episode count | GLOBAL | 12 | Jul 27, 2026, 12:00 AM |
| kitsu | favorites | GLOBAL | 12 | Jun 22, 2026, 12:00 AM |
| filmarks | score mean | JP | 88 | Jul 27, 2026, 12:00 AM |
| kitsu | rating rank | GLOBAL | 559 | Jun 22, 2026, 12:00 AM |
| niconico | episode views | JP | 3,811 | Jul 27, 2026, 12:00 AM |
| crunchyroll | series available | GLOBAL | 1 | Jul 27, 2026, 12:00 AM |
| shikimori | member count | GLOBAL | 282 | Jul 24, 2026, 12:00 AM |
| crunchyroll | episode dislikes | GLOBAL | 128 | Jul 27, 2026, 12:00 AM |
| niconico | episode mylists | JP | 10 | Jul 27, 2026, 12:00 AM |
| kitsu | score mean | GLOBAL | 81.22 | Jun 22, 2026, 12:00 AM |
| shikimori | completion ratio | GLOBAL | 0.01 | Jul 24, 2026, 12:00 AM |
| google trends | interest daily | GLOBAL | 7 | Jul 21, 2026, 12:00 AM |
| x official jp | silent days | JP | 0 | Jul 18, 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 |
| youtube | uploads 30d | GLOBAL | 25 | Jun 29, 2026, 12:00 AM |
| youtube | uploads 7d | GLOBAL | 25 | Jun 29, 2026, 12:00 AM |
| youtube | views 7d | GLOBAL | 20,721 | Jun 29, 2026, 12:00 AM |
| youtube | subscribers total | GLOBAL | 0 | Jun 29, 2026, 12:00 AM |
| shikimori | score mean | GLOBAL | 0 | Jul 24, 2026, 12:00 AM |
| youtube | channel views total | GLOBAL | 0 | Jun 29, 2026, 12:00 AM |
| youtube | views 30d | GLOBAL | 20,721 | Jun 29, 2026, 12:00 AM |
| x official jp | posts 7d | JP | 20 | Jul 18, 2026, 12:00 AM |
| mangaupdates | bayesian rating | GLOBAL | 6.47 | Jul 22, 2026, 12:00 AM |
| niconico | premiere comment velocity | JP | 0.82 | Jul 24, 2026, 12:00 AM |
| mal | watching | GLOBAL | 22 | Jul 27, 2026, 12:00 AM |
| mal | members | GLOBAL | 2,312 | Jul 27, 2026, 12:00 AM |
| anilist | popularity | GLOBAL | 1,891 | Jul 27, 2026, 12:00 AM |
| threads 7d | GLOBAL | 5 | Jul 27, 2026, 12:00 AM | |
| anilist | favorites | GLOBAL | 34 | Jul 27, 2026, 12:00 AM |
| anilist | trending | GLOBAL | 0 | Jul 27, 2026, 12:00 AM |
| google trends | interest weekly | GLOBAL | 35 | Jul 19, 2026, 12:00 AM |
| score 7d | GLOBAL | 166 | Jul 27, 2026, 12:00 AM | |
| thread count | GLOBAL | 5 | Jul 27, 2026, 12:00 AM | |
| mentions 7d | GLOBAL | 5 | Jul 27, 2026, 12:00 AM | |
| kitsu | member count | GLOBAL | 20 | Jul 27, 2026, 12:00 AM |
| mal | plan to watch | GLOBAL | 2,215 | Jul 27, 2026, 12:00 AM |
| mentions 1d | GLOBAL | 2 | Jul 27, 2026, 12:00 AM | |
| comments 7d | GLOBAL | 175 | Jul 27, 2026, 12:00 AM | |
| mal | completed | GLOBAL | 46 | Jul 27, 2026, 12:00 AM |