Niji-iro Hotaru: Eien no Natsuyasumi, Rainbow-colored Firefly: Never Ending Summer Vacation, Niji-Iro Hotaru ~Eien no Natsu Yasumi~, Rainbow-Colored Fireflies: The Eternal Summer Vacation, Nijiiro Hotaru: Eien no Natsuyasumi, 虹色ほたる~永遠の夏休み~, Rainbow Fireflies
Suddenly a thunder storm occurred and he slipped on the ground. He lost consciousness and woke up to find a girl and an unfamiliar village. He time-traveled 30 years and reached a village, which sank at the bottom of the dam.
This is Yuuta's precious memory of "another" summer vacation.
Last updated
Jul 28, 2026, 06:32 AM
Franchise timeline
Review every Courcast-tracked season for this series and jump between entries.
Courcast score breakdown
CourScore is the probability of an official sequel announcement within 18 months, blending attention velocity, completion strength, and catalogue health.
CourScore
51.7
CourScore is the probability of an official sequel announcement within 18 months.
Signal coverage: 100% • Signal freshness: High • Updated 6 hours ago
Top reasons
- Cross-platform audience rating - Weighted audience rating 69.1
- Key staff availability - Director Hisashi Mori has no other concurrent active productions
- Cross-platform popularity index - Aggregate reach of ~2,212 followers
Source runway is unclear, so feasibility is treated as unknown.
CourScore history
CourScore over time
Nijiiro Hotaru: Eien no Natsuyasumi renewal questions
Common questions about this title's renewal prospects, answered by Courcast's daily analysis.
- Is Nijiiro Hotaru: Eien no Natsuyasumi getting a new season?
- According to Courcast's latest analysis, Nijiiro Hotaru: Eien no Natsuyasumi has a 52% 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 Nijiiro Hotaru: Eien no Natsuyasumi be renewed?
- Nijiiro Hotaru: Eien no Natsuyasumi currently scores 52 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 Nijiiro Hotaru: Eien no Natsuyasumi's renewal probability?
- Nijiiro Hotaru: Eien no Natsuyasumi's CourScore is 52 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.
Fresh telemetry
Courcast watches every connected signal to surface the freshest indicators of momentum.
| Source | Metric | Geo | Value | Collected |
|---|---|---|---|---|
| shikimori | member count | GLOBAL | 1,783 | Jul 21, 2026, 12:00 AM |
| wikipedia | pageviews daily | EN.WIKIPEDIA | 292 | May 9, 2026, 12:00 AM |
| mangaupdates | bayesian rating | GLOBAL | 6.31 | Jul 22, 2026, 12:00 AM |
| youtube | uploads 7d | GLOBAL | 25 | Jun 17, 2026, 12:00 AM |
| youtube | views 7d | GLOBAL | 13,579 | Jun 17, 2026, 12:00 AM |
| kitsu | favorites | GLOBAL | 2 | Jun 26, 2026, 12:00 AM |
| kitsu | rating rank | GLOBAL | 5,072 | Jun 26, 2026, 12:00 AM |
| kitsu | member count | GLOBAL | 939 | Jun 26, 2026, 12:00 AM |
| kitsu | score mean | GLOBAL | 70.58 | Jun 26, 2026, 12:00 AM |
| youtube | channel views total | GLOBAL | 260,870 | Jun 17, 2026, 12:00 AM |
| youtube | views 30d | GLOBAL | 13,579 | Jun 17, 2026, 12:00 AM |
| niconico | episode mylists | JP | 45 | Jul 28, 2026, 12:00 AM |
| crunchyroll | series available | GLOBAL | 1 | Jul 28, 2026, 12:00 AM |
| niconico | episode views | JP | 7,346 | Jul 28, 2026, 12:00 AM |
| youtube | uploads 30d | GLOBAL | 25 | Jun 17, 2026, 12:00 AM |
| youtube | subscribers total | GLOBAL | 1,290 | Jun 17, 2026, 12:00 AM |
| google trends | interest daily | GLOBAL | 0 | Jul 10, 2026, 12:00 AM |
| google trends | interest weekly | GLOBAL | 0 | Jun 28, 2026, 12:00 AM |
| niconico | episode comments | JP | 103 | Jul 28, 2026, 12:00 AM |
| mal | completed | GLOBAL | 3,009 | Jul 21, 2026, 12:00 AM |
| anilist | trending | GLOBAL | 0 | Jul 21, 2026, 12:00 AM |
| mal | members | GLOBAL | 8,991 | Jul 21, 2026, 12:00 AM |
| mal | watching | GLOBAL | 351 | Jul 21, 2026, 12:00 AM |
| anilist | average score | GLOBAL | 67 | Jul 21, 2026, 12:00 AM |
| mal | plan to watch | GLOBAL | 5,330 | Jul 21, 2026, 12:00 AM |
| shikimori | score mean | GLOBAL | 69.9 | Jul 21, 2026, 12:00 AM |
| anilist | popularity | GLOBAL | 3,424 | Jul 21, 2026, 12:00 AM |
| shikimori | completion ratio | GLOBAL | 0.33 | Jul 21, 2026, 12:00 AM |
| anilist | favorites | GLOBAL | 34 | Jul 21, 2026, 12:00 AM |