Wow that was a pain in the ass trying to logout and re-login.
I suggest you read everything I have written first, so you know what is coming up next and can finish this relatively quickly.
I registered on the computer because it was getting really inconvenient on the phone. Pepe’s link is right, but this is the more direct one: http://yahoo-mbga.jp/login
Click on the orange button, and it will bring you to a login prompt, next to some ads. Below on the right, click on 新規取得, and it will bring you to the new account creation page.
Follow the blanks one by one:
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Email Address (I suggest you use a gmail one. Once I registered for something online, the only email that was easily available for the U.S., assuming you are in the U.S., was gmail.com)
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Username
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Password
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Reenter Password
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Zip Code: enter 0000000
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Male/Female
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Birthday
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Do you want to sign up for Yahoo mail magazine
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I believe you know an amount of Japanese. In the graphic verification, enter the hiragana shown. In the vocal verification, there will be a voice clip of a woman saying whatever with another voice in the background saying 6 numbers in Japanese from one to nine (maybe zero?).
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T points for some T card. I didn’t bother with it since I’m only using this ID for ABOW. It is on default “I don’t have the card.” (持っていない)
Then click the orange button to go to the confirmation page.
Check the box that says 同意する, meaning you agree to Yahoo JP’s terms about the T card. Don’t worry about it. Click the orange button.
You should be done on the computer.
Now I apologize in advance because I don’t exactly remember the mobage steps on the phone, and I don’t want to potentially mess up with another account. I’ll try my best, though. Also the Help page says absolutely nothing useful.
- Go to その他 > Mobage へ (very bottom)
- Tap マイゲーム, the button on the very right.
- Go down until you find パソコンから遊べるYahoo!モバゲー, a long button with a computer monitor.
- Tap the orange button that says ブラウザを起動, which starts your phone’s default browser. This will bring you to the actual Mobage site in mobile version, hence the “sp.” in the URL which you will see.
- Tap the blue link in the middle, which gets you to the same screen I gave you in the beginning.
- Tap the orange button, and you will get just a login screen. Login with your username and password.
- That should bring you to a page of colorful stuff and your avatar on the right.
This part is where it gets fuzzy for me. Your old phone now should be logged in. Open ABOW again, and it should bring you back to the screen after step 4, assuming you don’t leave your game running in the background too long. Tap the middle button マイページ of the 5 you see on the bottom, and it should bring you to a profile page with your avatar on your left, wanting to fight someone as always. If this page shows, then yay you have succeeded. You can check further by locating the ログアウト button on the lower left of the Title Screen, below Tap to Start, or go to その他 > シリアルコード, in which you could not access before and can enter serial codes you get from buying various things, probably Key related, in Japan.
So now download ABOW on your new phone, and, on the start up screen, it should have two buttons: the red quickstart one, and a white log in one. Tap the log in button, and it should bring you to a log in prompt. If that doesn’t happen and opens a browser window instead, tap back button on your phone, and it should bring you back to game and the login prompt. Log in with your Email Address and enter the verification, and it should work. In the event that this login prompt wonks out, which it did for me, quickstart and repeat steps 1-6, and that should work, too.
Well, good luck! Not saying I know exactly the steps, but hopefully it helps.