CommentStreams:7168c440de57c06e681d232bf100ae00
From The Lost Media Wiki
First link is the aforementioned photo book with stills from the movie, which can be found for sale in other websites (mostly auction sites) Second link is an article covering the Happy Together broadcast mentioned in the post Third link is probably a photo from a page in the photobook, but it lists some people who worked on the movie that we could probably contact. Will make another comment with the translation, thank you.