On the sponsor page you spelled it エバートンFC and the right one is エヴァートンFC.
also on the sponsor page カイオ you dont have the logo on the right of the name.
also missing 「 on クン
if you click on games, others are translateed but the bottom 3 is not , blackjack, baccart and roulette.
if you go to transaction deposit is in Japanese but Withdraw part is in english
Also the drop is in english should be ドロップ
regarding the rain part,
レインを受け取りました、レインを送りました、レーキバックを受け取りました its a sentence so better make it 1or 2words
If you open stats on the top statistic is in english
also trophy is in english tooo
if u go under the カジノsection
roulette and blackjack is in english
if you go to offers section the title is in Japanse but under that it says
find bonus drop codes on our social medias such as x.com
Hirakazu
part 2
https://stake.com/ja/blog/casino-house-edge-guide this is in english
https://stake.com/ja/vip-club this one is in english too
https://stake.com/ja/blog 1st part is japanese and 2nd part is english
How-to Guides you should change the name of this ハウツーガイドsound weird