Bus from Yamagata to Oishida

Hello,

I'm planning to visit Ginzan Onsen next April and I'm trying to figure out how to get there. I'll be staying near Yamagata Station and plan to spend the afternoon there.
I saw the bus timetable from Oishida to Ginzan Onsen and I'd like to take the bus at 14.10 but according to Hyperdia the train from Yamagata arrive in Oishida at 14.20 amd the one before that at 12.30 which is not very convenient for me.

I'd like to know if there's a bus from Yamagata to Oishida that would get me there at around 2pm, otherwise I'll just have to take a taxi to Ginzan instead.

Too early.
Next APR train timetable update after 20 MAR.

Thank you for your reply.

I'll check again closer to the date, but just in case, I'd still like to know if such bus exists.