Hi. If you're looking for a ferry terminal that will take you to Kobe from Imabari, unfortunately, there is none available. Your best chance and the fastest mode is to take a train from Imabari to Okayama (Ltd Exp Shiokaze) then from Okayama to Shin-Kobe (Shinkansen Nozomi). Or you may catch a night bus from Imabari to Kobe Sannomiya (Willer Travel) but will consume around 6 hours.
However, you may wish to get to Niihama Port in Ehime which is located near Takihama Station. There is a casual ferry (Shikoku Orange Ferry) that runs from Niihama Port to Kobe Rokko Port. You may want to check their website for you to access their timetable as follows: https://www.orange-ferry.co.jp/