These booklets inside just consist of literal Tenchi Universe episode screenshots in a comic book layout, the only new art are the covers but I find them pretty :)
Found only one copy of this online in Japanese forum and edited as good as a photograph will allow until we get an actual scan onday. From Kajishima Onsen Omatsuri Zenjitsu no Yoru Tenchi Ban – the Bride Game which was the focus of a doujin in a C93 here: