Literally the grandmother mountain, but it's not the easiest one!!! From Oita station (大分駅)  took a local train and got off at Bungo-Taketa station (豊後竹田駅). From there I used a local minibus called Kamoshika-go (カモシカ号), the best name ever for a bus!!! I was the only guest that day, so the driver, very friendly, gave me its number, when I finished I called hime and he picked me up!!! Amazing!!!