I'll say this here for two reasons: one I would love to be proved wrong by Kobo owners and two I have been told by many electronic book reader owners that reader that Geco needs is a Bookeen. Bookeens specialize in non-english langeuge books and since he needs to acomodate Italian and Japaneese this is the one he needs:
http://bookeen.com/en/.
Also try Open Office, a free Microsoft Office clone that is fluent in both langueges: it.openoffice.org and ja.openoffice.org.