Cerys didn't even want to go to the Shrine and had to be prodded.
There is literally
no given plain [] Accept vote
It is literally "I'll decline" or "I'll think about it over lunch"
Does a person who heavily prodded to go to a place, and whose vote options doesn't give an immediate accept option, sound like a person who finds this type of thing fun, and would consider it a vacation activity?
I'm not saying don't vote for the think about it option, but don't fool yourself into thinking that Cerys would do it because she thinks it is a fun idea.
Doing this means less time with her sister, less time with Willow, and less time with her girlfriend on vacation.
Outside of these next three days Cerys has to worry about the uncertain future, with driving the world to be strong enough to repel any possible invaders from the LDC, any possible magical girl shenanigans now that, as evidenced by Sabina, and then by the Sunken Trio, natural magical girls are spawning, trying to deal with Sabina's Swordness, training and other stuff.
For Cerys to even be able to conceivably get anywhere on being a miko, she is probably either going to, as Naron stated, have to work really hard over the next three days to
possibly get the basics down… and there is no guarrentee that would be long enough for even that…
Or Gaia is going to leave us in Japan to gain more knowledge, because
she has to go, but we don't, then getting us when she needs us (I assume that the barrier around Japan only stops teleports in, not teleports out, though if not, Cerys would just have to fly far enough from Japan to pass the barrier at that point anyway.). Or just teaches us herself after the vacation, which then begs the question of why she didn't just do so in the first place, though I suspect I have at least a few answers to that:
1. This method will probably
require Cerys put on Miko robes instead of Gaia just asking for that and Cery ignoring
2. Traditional Japanese aesthetics and shrine should
obviously be the starting point of such training
3. Knowing how the Japanese would perceive us as a Spirit, she brought us here to have someone start giving faith to us, to give Cerys the incentive to make the decision on her own once she finds out about it, rather than force her to take the option.
4. Have us not rely on her for everything.
I'd take a guess, and say that Gaia getting us to come here is because she
wants us to take this offer, but I disagree with it.
[X] Decline her offer.
I'd like this vacation to stay a vacation.