Ojomodera no Youkai Jizou(1985)

Ayuko Mayama, Kana Aizaki, and Kazuma Oki are a close-knit trio of friends. The three of them end up spending their vacation in S Village, nestled in the mountains, where Kana’s grandmother lives. Surrounded by abundant nature, the three are having a great time, but they’re warned to stay away from just one place: Ojomodera, a temple located near a waterfall. The temple’s proper name was Senyaji, but it was called “Ojomodera” because it was said that a yokai named “Ojomo” appeared there. It was said that the head priests there had gone mad and died one after another, so none of the villagers would go near it, and it had become an abandoned, dilapidated temple. The three promised not to go near it, but while playing outside, they were caught in a sudden summer shower and had to take shelter at Ojomodera.

(Source: Kaiki Manga no Anagura, translated)