I've been to Japan recently and saw all kinds of toilets. I encountered types like that as well and honestly it's not that difficult. I don't speak Japanese but

I've been to Japan recently and saw all kinds of toilets. I encountered types like that as well and honestly it's not that difficult. I don't speak Japanese but you'll quickly figure out that the dots represent the water amount for flushing, that there are probably two bidet functions per gender (water more spread out or not), that the "sliders" control the pressure etc. There are other buttons for deodorization, sounds and whatnot but well, that's just the cherry on top. I miss them!