Shima Onsen to Ikaho Onsen by bus

Hi,

I understand that in order to reach Ikaho Onsen from Shima Onsen, one needs make a transfer in Nakanojo. I've found a bus timetable from Shima Onsen to Nakanojo, but I'm not able to find any timetable from Nakanojo to Ikaho Onsen. Would anybody know where this would be available? Or is there any direct connections between the two onsen towns? I'm travelling on Dec 2.

From Nakanojo, take the JR Agatsuma Line to Shibukawa (30 min) and a bus from there (25 min). The bus operates every 20-30 minutes, and the train once per hour:
https://www.japan-guide.com/e/e7476.html