The PPP and EXE Taimanin onahole Line. Mostly because the series left a very memorable first-impression many, many years ago. The lubes are irrelevant to me.

I think I have all of them now, not 100% sure...

@Papi maccos japan has a series, the cock fit series of which I currently have two products in the series, but I'd like to get all of them eventually. The two holes that I do have in this series are my favorite sleeves, so I would assume that I'd also like all of the rest in the series.

@Papi Short answer no. long answer is it does help me with exposure to different holes and shopping variety. A series of onaholes will get me intrigued to certainly take a hard look at all of them and see the differences. The Meiki line, the Tomax Muses, or Lilith or Venus lines or the Absorption lines etc. But usually there's one or two clear stand outs from tunnel design and reviews I want to try and the rest fall to low priority. If I had crazy disposable income I might try them all for the heck of it but good sensation trumps collectability for me though I do certainly understand the collector mindset for normal figures/non sex toys so I get it. The closest I've gone to 'collecting them al' is I have about half of the Meiki line and usually they have performed well though that said there's been one or two disappointments so I'm careful about wide spread buying though I have my eye on two more of the later models to try out eventually.

@Papi It really depends on a lot of factors, I just ordered the "Niku-Man Delta", so I guess we'll see if I end up getting the "Nama Niku-Man" If I enjoy the delta. I probably wont get the "Niku-Man 2200" though, simply cause I''m not big on hip/torso onaholes and prefer just the sleeves, especially considering how much pricier they are in general.