You should try..

英語
You should try the Office 2016 Preview if you: enjoy trying out software that's still being developed and providing your insights and feedback; you know how to reinstall your previous version of Office;
日本語
開発中で洞察力や感想などを提供しているソフトウェアを使ってみるのを楽しめ、前回バージョンのOfficeを再インストールする方法を知っているなら、Office 2016を是非使ってみてください。

You should try out the office 2016 preview if you enjoy trying out software that is still being developed and providing your insights and feedback and you also know how to reinstall your previous version of office.