The Popular Series tag ended in 2015
人気シリーズ, ninki series, means “popular series.” The English navigation gives it no name. We gloss it as Recurring Series, and it covers 128 titles.
It is the most self-defeating label on the site, because the thing it describes now has a much better implementation and the tag was never removed.
This page contains affiliate links. Prices and plan details are what the official site showed in November 2026.
What it was for
Before the studio’s series had prominent names and their own listing pages, there needed to be some way to signal “this belongs to a run, there are more like it.” A general tag did that job.
Thirty-six different named series appear among the 128 tagged titles, which tells you it was a catch-all rather than a specific line.
Why it stopped
The titles run from January 2005 to 15 April 2015. Nothing since.
By then the studio had 115 named series covering nearly 3,000 titles, each browsable on its own. A tag saying “this is part of some series” adds nothing when you can see which series and click through to the rest of it.
The tag was made redundant by a better feature and then left in the navigation. That is the whole story, and it is a common shape — sites add capabilities and rarely remove the scaffolding that preceded them.
Dynamite: Mei MatsumotoWhat to use instead
The series themselves. To give a sense of the scale, the largest named series has 321 entries, the second 186, the third 157. Fourteen series have more than 40 titles each.
Browsing a series gets you consistency of format, length, and approach in a way that no tag on this site does. If you liked one title and want more of the same, the series it came from is by far the most reliable route — more reliable than the performer, and much more reliable than any category.
This is the single most useful browsing habit we can recommend on this catalogue, and it is not the one the navigation pushes you toward.
What the tagged 128 are
Since it was a general label, the contents are miscellaneous. The largest single contributor is the studio’s drama line with fourteen, followed by its long-running escort-themed line with nine.
95% carry the Original tag, higher than the catalogue’s 81%, which fits — a series is something a studio builds, not something it licenses.
99 distinct performers appear across 128 titles. The most frequent appears in two.
Sweet Real SexThe rating figure, and what not to read into it
4.30 against a catalogue average of 4.56. Low, and the same pattern we see with kikakumono and zamen.
Our reading is that this is an age effect rather than a quality signal. All three of these tags stopped being applied in 2014–2015, so their contents are entirely pre-2015, and older material across this catalogue rates lower in general — partly production standards, partly that ratings accumulate from an audience browsing current releases.
We flag it because a rating average is easy to misread as “this category is worse.” What it mostly measures here is when the material was made.
How to spot a dead tag yourself
Sort the category listing by date and look at the newest entry. If it is years old, the tag is an archive.
Ten of the 73 categories on this site turned out to have had no new title in over two years, and six of those ten are among the seventeen the English navigation never named. Given that those seventeen have no English name in the first place, an English-speaking browser has essentially no way to tell. Our glossary page now marks every dormant category with the date it was last used.
Ryu Enami's practical instruction on the sex method to please a man - Cumming Nipple editionThe short version
- Ninki series means popular series; the English navigation gives it no name
- 128 titles, and the newest is from April 2015
- Made redundant by the 115 named series, which are browsable individually
- Browsing by series is the most reliable way to find more of what you liked
- Its low rating average reflects age, not quality — everything in it predates 2015
