I've grown a bit skeptical of the origins of most every sudden Japanese trend. With the Oshiri Kajiri Mushi, aka Bottom Biting Bug, cartoon that washed over Japan last summer, it wasn't until the late fall/Christmas season before Japan's public broadcaster NHK got any real merchandise onto the market.
Is that the natural timeline for a manufactured trend? Wouldn't you get more money if the merchandise were ready when the trend was still white-hot, and NHK was frantically deleting the OKM video from YouTube like a copyright-chasing Wack-a-Mole?
Maybe despite the giant corporate plushploitation machinery targeting it, humanity's consumerist ass is not so easily and quickly latched onto after all. If it were, don't you think they'd have had the Oshiri Kajiri Mushi toilet paper ready before December? There is still hope. [But no relief, at least from Amazon, which won't ship the goods outside Japan.]
Oshiri Kajiri Mushi small [20cm] plush doll, 998 yen, Japan delivery only [amazon.co.jp]
Oshiri Kajiri Mushi toilet paper in green or pink
All the Oshiri Kajiri Mushi stuff you can't get outside Japan
Mono Comme Ca had a swack of stuff in October/November if memory serves, but it was all pretty small -- little toys, designer items, etc. I somehow managed to resist buying any of it...