JDM vehicles in general do not have English options on the head units designed for Japan (due to custom satnav, connectivity to japans road communication network, radio frequency ranges that are not generally used elsewhere etc, unless it is a headunit also used on the export models for Hong Kong or Malaysia, in which case they tend to have lower spec headunits in English.
You most certainly will need to get used to the interface, which didn't take long to be fair, or swap it out for a uk headunit
I've owned import Toyota's since 1999, and just never bothered replacing the fitted units, they do what they are designed to do. Play music.
Cheapest fix is a radio band expander for about £15, and a Bluetooth to FM adaptor if an aux in is not available.