@Kekkz Have you carefully looked at what the blank field asked for? It’s pretty dumb, but at one website it asks for your Yahoo JP ID, and at another it may ask you the E-mail you used for Yahoo JP.
If you are currently sure that you have entered the right thing and right password, try to reset your password through ログインできない then Yahoo! JAPAN ID を忘れた by entering the email address you use for Yahoo JP and your birthday.
If you are double sure that you have the right everything, you got this going on:
Saying they apparently have some difficulties with emails…they are probably just talking about Yahoo Mail, but who knows. If this is unrelated to your problem, which I greatly believe that it is, I have no further ideas.
@Bizkitdoh I have spent 12 gacha tickets yesterday and not even one random SR haha
I just want that SSR Sekine PLS GIFF