21 Seiki Shounen

21st Century Boys · 21世紀少年 · 21stCB

mangaJapanJapan2006
Updated 10 hours ago
Last deep analysis: never
Popular Love
58
Signal Breakdown
Social Sentiment
Audience Score
Longevity of Affection
Audience Score Reach
Reddit Volume
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Reddit Engagement Reach
Discussion Depth
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Cross Platform Breadth Reach
Fan Works
90-Day Trend
True Feel
91
Cult Favourite
68
Rising
--
Recommend
86
Reach Meter
70
Reach Breakdown
Audience Score
Reddit Volume
Reddit Reach
Platform Breadth
90-Day Reach Trend

1Core Metadata

Title & Origin
Canonical title
21 Seiki Shounen
Original title
Not yet measured
Country
Japan
Language
ja
Territory
Global
Release & Format
Format
manga
Release status
completed
Release date
1/1/2006
Duration (min)
Not yet measured
Episodes
Not yet measured
Rights & Rating
Rating system
Not yet measured
Rating
Not yet measured
Licensing
Not yet measured
Distribution
Not yet measured
Volume count
Not yet measured
Creator
Naoki UrasawaCreator
Alternate Titles
21st Century Boys
en
21世紀少年
jaOriginal
21stCB

2Content

Synopsis

War is over. The Friend is dead. Mankind no longer faces the threat of extinction. Peace has finally come to Tokyo... Or has it? The mystery still remains. Nobody knows who the Friend was and where he came from. The only clue is hidden deep within the memories—the memories of the hero Kenji. It is time to open Pandora’s Box to discover what is left...

Tags & Format

Themes

DramaMysteryPsychologicalSci-FiConspiracySeinenCultGhostMilitaryVirtual WorldAugmented RealityRobots

Tone

Not yet measured

Content Warnings

Not yet measured
Target age rating
Not yet measured
Content format
manga
Awards

Not yet measured

3Commercial Metrics

Box Office
Box office
Not yet measured
Currency
Not yet measured
Original
Not yet measured
Revenue
Total revenue
Not yet measured
Revenue tier
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Awards
Not yet measured
Sales & Streams
Units sold
Not yet measured
Streams
Not yet measured
Rights
Rights status
Not yet measured
Distribution
Not yet measured
Revenue tier
Not yet measured

4Audience Intelligence

reddit
Score
79.7
Score count
29
Rank
29
Audience size
241,036
Last updated
6/11/2026

5Industry Links

AniList

anilist

MyAnimeList

mal

Cover Image

other

6Community Sentiment

How people are talking about this IP — each row is a different signal: reviews, ratings or comments from one source.

Positive ≥0.6Mixed 0.4–0.6Negative <0.4
How sentiment scores are calculated