Which languages are available on the pre-launch event page?

The event page is available in English, Japanese, Korean, and Traditional Chinese.

Does the event-page list determine the full client language?

The official notice says players may choose a different language in the full game client later, so use the thirteen-language store listings when checking client support.

Aniimo Supported Languages

Steam and the App Store list thirteen Aniimo languages, while the pre-launch event page uses a separate four-language interface.

Aniimo Supported Languages — Steam and mobile language list

Steam lists English, Simplified Chinese, Japanese, Traditional Chinese, Korean, French, German, Russian, Indonesian, Thai, Portuguese–Brazil, Spanish–Latin America, and Vietnamese. The App Store lists the same thirteen language families.

Aniimo Supported Languages — Pre-launch event languages

Which languages are available on the pre-launch event page?: The event page is available in English, Japanese, Korean, and Traditional Chinese.
Does the event-page list determine the full client language?: The official notice says players may choose a different language in the full game client later, so use the thirteen-language store listings when checking client support.