Overview
Xenosaga is part of the thematic Xeno series developed by Monolith Soft, whether in their guise as developers working under Square on Xenogears or the significantly more well-known Xenoblade Chronicles series. Episode I was released in 2002 for the PS2 while Episode II dropped in 2004 alongside the Japanese-only mobile game Pied Piper; the final episode was released in 2006 with a remake of the first two episodes released for the DS in the same year.
However, you probably know Xenosaga largely for everyone’s favorite emotionless robot girl KOS-MOS, who is essentially the mascot for the entire series. After bursting into popularity, KOS-MOS has since appeared as representative of the series in various crossovers, appearing in Namco x Capcom, Project X Zone, Xenoblade Chronicles 2 and even Namco’s Tales series.
As a fun fact, her designer CHOCO is good friends with BLADE of Busou Shinki and Megami Device fame.
So, naturally, Kotobukiya ended up creating a model kit of KOS-MOS in 2012. Now, you might be asking why this has the Historical tag, and it is because of KOS-MOS’ role in developing Kotobukiya into what it is today. After their successes with the Valsione and RACaseal (detailed in their respective sections), Kotobukiya’s Hidehiko Nouchi used the success of KOS-MOS’ kit in 2012 to finally bring forward his dream project, putting forward the proposal that would become Frame Arms Girl in 2014 for release in 2015.
Naturally, being so key to Kotobukiya’s existence as it is today, KOS-MOS Ver.4 would receive a reproduction kit in 2025, similarly to fellow legendary kit RACaseal.
There is also a lesser known Ver.1 kit; this entry will focus itself on Ver.4 (and to an extent, its extra coating version released to commemorate Episode 3).
Construction and Engineering
While KOS-MOS did convince Nouchi to finally pursue what would become Frame Arms Girl, this does not mean that KOS-MOS is by any means a perfect kit, even by period standards Infamous for fragility and brittleness, KOS-MOS shows both her age and the progress in girlpla engineering and construction Kotobukiya has since made. Examining some of her joints, however, you can see where Kotobukiya drew inspiration for Frame Arms Girl. This kit also somehow predates proper accounting for action stands, using a pincer-style connector that can be more fiddly than a peg connector.
Aesthetics
Aside from huge fans of KOS-MOS or Xenosaga, this kit looks pretty good for 2012. However, being from 2012, you will need to do some work to paint and color correct this kit in a way you would not really have to do with the modern standard, so keep that in mind; this is generally true of most Kotobukiya kits whose designs hail from prior to 2015 (such as the RACaseal).
Ease of Acquisition
Fortunately for those who’re prepared to put in the work, Kotobukiya re-released her in 2025, retailing at a stiff ¥6800 (roughly £32/ $43) in her extra-coating edition. In an inversion of the usual rules for these kits, second-hand will NOT help you find them cheaper; however, buying them second hand is not necessarily largely because she’s never really left print.
Personal Verdict
While by modern standards, KOS-MOS really isn’t much to write home about, comparing her to her immediate contemporaries from the early ’10s, you can see why KOS-MOS was the real beginning of the girlpla boom. Expect to do quite a bit of work and expend some elbow grease to get her to the same level as kits made way later, but honestly, there are harder and worse kits to have. Her historical value, of course, can’t be understated. And if you’re a huge fan of KOS-MOS, why not get this kit?
Official Site: https://www.kotobukiya.co.jp/en/
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