Courtesy of another beautiful, dedicated tumblr ファン (smallhirodork @ tumblr), あなた can download the entire Hiro's Journal book, which details Hiro's point of view of all the events of the film. Needless to say, major spoilers.
In Japan, the film is called "Baymax" (ベイマックス). This link will 検索 "ベイマックス" on Disneystore, 表示中 all of their products. When their December release 日付 gets closer, and they create a page, I will link to that instead.