Hmm to be honest, the two Japanese toy's i have don't have hard entrances per se. Have the Mouth of Truth and Wonder Ring Poco Pen(Review of it here https://boards.onahole.eu/a/res/599.html
). Mouth of truth is extremely loose in my opinion. So long as you don't mind the teeth, it's great. Got the WRPP because the teeth on Mouth of Truth left me a little 'raw' feelings for 24 hours after use. Have sensitive skin. The WRPP does have some tight rings in it, though to be honest I can't really feel them at all. The over-sized nubs also don't really do much for the over all feel of it. The anal can in the WRPP is also kind of lack luster due to it opening up into a giant chamber after the entrance which is tiny.
If the entrance seems to tight, I'd suggest more lube/better lube. How I got around it whit my WRPP, just applied a bit more lube than should have been needed, but can slip in easily and no real pain… Mind you it has started to tear form my size and possibly roughly handling it though I don't think I have been all that rough with it as i want this expensive toy to last heh.
Agree with hake ( >>620
) The Rina/Roa's are usually good 'first time experiences' for onaholes. Went to Mouth of Truth first because I had already tried several american holes and found them lackluster and tossed em out as garbage. Thought I'd be thick skinned enough for the teeth but I was wrong heh.
Also form everything I have read, look at getting holes with out the vibrator than get and egg or the like to go with it to place on the outside of the toy, can always tap and egg to the very end of a toy for hands free that way or along the length/side of the toy if you get a small/short length vibrator.
Hope it helps and good luck with your toys!