If you want to unlink VRoid Mobile from VRoid Hub or your pixiv account, or if you want to link VRoid Mobile to another account, follow the following steps.
1. Log out of pixiv
Access the following link on your device.
Tap the three lines menu icon on the upper left side > scroll down to the bottom of the menu > tap Logout
2. Unlink VRoid Mobile from VRoid Hub via VRoid Mobile
Open VRoid Mobile and tap the three lines menu icon on the upper left side of the character making page > Settings > Account settings > Linked apps > "解除する（tap Unlik for VRoid Mobile）"
The question "このアプリとの連携を解除します。よろしいですか？（Are you sure you want to unlink this app?）" will pop up. Tap "はい（yes）".
3. Log out of VRoid Hub
(1) Access the following link on your device. (If you already did the unlinking process described in 2., proceed directly to (2))
(2) Tap the three lines menu icon on the upper left side > tap Logout
4. Log out of VRoid Mobile
Open the VRoid Mobile app and select any character to open the character making page.
Tap the three lines menu icon on the upper left side > Settings > tap Logout
The question “VRoidからログアウトします。よろしいですか？（Are you sure you want to logout from VRoid?）” will pop up. Tap "ログアウト（Logout）".
You can unlink VRoid Mobile from VRoid Hub or pixiv through the steps described above.
If you want to link VRoid Mobile with another VRoid Hub or pixiv account, open the VRoid Mobile app again after you have done steps 1. to 4. above and link VRoid Mobile with the account that you want by following these steps:
1. Tap "はじめる（Start）"
2. Tap "同意する（Agree）" after reading "利用規約（the Terms of Service）", "プライバシーポリシー（Privacy Policy）", and "ガイドライン（Guidelines）"
3. Tap "続ける（Continue）"
4. The question "あなたのアカウントをVRoidモバイルと連携しますか？（Do you want to link your account with VRoid Mobile?）" will appear. Read the content, tap "ログインして連携する（Login and link）", and log in to VRoid Hub (or create a new account) before proceeding.
*The e-mail address entered at the time of registration will be required if you want to reissue your password or unsubscribe, so be sure to keep a copy of it.