Japan Hot 100 — Year-End Hot 100 Movements (December 2025)

December 2025 was not defined by a wave of brand-new releases, but by momentum, endurance, and consolidation on the Billboard JAPAN Hot 100.
As the year closed, songs released earlier—particularly in November—continued to shape the chart through physical sales carryover, streaming stability, and year-end listening behavior.

This post highlights the songs that dominated the Billboard JAPAN Hot 100 in December 2025, followed by a focused look at the longest-standing tracks on the charts by the end of the year.

🗓 Songs Driving the Billboard JAPAN Hot 100 in December 2025

Title	Artist	Original Release
Present	INI	November 19, 2025
Steal The Show	timelesz	November 12, 2025
青春のデッドライン (Seishun no Deadline)	NMB48	November 12, 2025
いきどまり (Ikidomari)	星野源 (Gen Hoshino)	November 14, 2025
狭心症 (Kyōshinshō) (RADWIMPS cover)	Mrs. GREEN APPLE	November 19, 2025
前前前世 (Zenzenzense) (RADWIMPS cover)	Vaundy	November 19, 2025
トレモロ (Tremolo) (RADWIMPS cover)	米津玄師 (Kenshi Yonezu)	November 19, 2025
いいんですか? (Ii n desu ka?) (RADWIMPS cover)	My Hair is Bad	November 19, 2025

These titles maintained strong visibility on Billboard JAPAN Hot 100 charts published in December 2025, despite originating from November release schedules.

🎙 Artist & Project Highlights

INI

INI closed 2025 as one of the most commercially stable boy groups in Japan.
Their releases consistently convert fan engagement into physical sales power.
“Present” was positioned as a winter-themed, emotionally resonant single.
Rather than fading after release week, it maintained high chart presence into December.
The song became a defining year-end anchor on the Hot 100.

timelesz

timelesz embody legacy idol strength adapted to modern chart mechanics.
Their release strategy emphasizes collector editions and first-month durability.
“Steal The Show” sustained chart relevance beyond its debut cycle.
December confirmed its endurance rather than novelty.
This was longevity driven by fandom discipline.

NMB48

As part of the long-running 48-group ecosystem, NMB48 rely on consistent fan mobilization.
“青春のデッドライン” extended its chart life through December.
The song benefited from theater exposure and year-end event activity.
It reflected the stability of idol-centered chart models.
Momentum, not surprise, defined its performance.

星野源 (Gen Hoshino)

Gen Hoshino’s music typically grows through gradual listener adoption.
“いきどまり” aligned naturally with reflective year-end moods.
Streaming and airplay increased steadily across December.
The song resonated strongly with adult and narrative-focused audiences.
Its chart presence felt organic rather than promotional.

RADWIMPS Tribute Project — Dear Jubilee

One of December’s most distinctive chart phenomena was the RADWIMPS tribute project.
Multiple artists released covers simultaneously, creating layered chart entries.
Rather than nostalgia alone, curiosity drove replay and comparison.
Each interpretation brought a different emotional tone.
The project behaved like a collective release wave.

⏳ Longest-Standing Songs on the Billboard JAPAN Hot 100 (End of 2025)

While December reflected short-term momentum, several songs stood out for endurance across the year.

Title	Artist	First Chart Appearance (approx.)	Weeks on Chart (approx.)	Longevity Driver
IRIS OUT	Kenshi Yonezu	Aug–Sep 2025	14–18 weeks	Streaming stability + cross-demographic appeal
Bling-Bang-Bang-Born	Creepy Nuts	Spring 2025	30+ weeks	Viral reach + anime exposure
SPECIALZ	King Gnu	Late 2023 (resurged 2024)	40+ weeks (intermittent)	Anime tie-in + catalog replay
Night Dancer	Imase	2022 (recurrent)	50+ weeks (non-continuous)	Global streaming + slow-burn growth

🔗 Sources

Billboard JAPAN Hot 100 weekly charts (December 2025)
https://www.billboard-japan.com/charts/hot100
Billboard Japan News reports (INI, tribute project coverage)
Oricon News (year-end sales and idol releases)
Universal Music Japan & Sony Music Labels press releases
Official artist websites (INI, Gen Hoshino, Kenshi Yonezu, Mrs. GREEN APPLE)