Muten Kura - One Piece/Youkai Watch

Hi there! Am visiting Japan for the first time next month and am excited to try the sushi train/gacha outlet. Checked the website and it seems they have a One Piece and Youkai Watch promotion going on and was wondering how I'd be able to collect them.

The links are:
http://www.kura-corpo.co.jp/image/bn_1506yokai.jpg
http://www.kura-corpo.co.jp/image/bn_1508op.jpg

Thanks in advance!

yokai watch items are small toys for younger children.
one piece items are straps for key holders and mobile phones.
you can buy them at the restaurant. but you can't select a desired model. (they sell it randomly in each series.)

by the way, kura-sushi does not accept credit cards. cash only.

Thanks for the translation, and the last piece of advice about the payment methods. It was very helpful!