Nadeko Medusa, Part Four Episode 15

Shinobu reveals that during her first visit to Japan, 400 years ago, she saved the local people from a severe draught by accident and was revered as a goddess by them. She then spent the next years living as a goddess in Japan until all the villagers started disapearing mysteriously, until only Shinobu and a demon hunter she befriended remained. Soon after, the same being that Koyomi met attacked them and Shinobu barely escaped alive, taking with her the demon hunter's hand by accident, which she used to revive him as a servant of hers just like Koyomi. However, the man blamed her for all that happened and unable to reason with him, Shinobu watched him commiting suicide by exposing himself to the sunlight. Since then Shinobu never returned to Japan until six months ago, when she and Koyomi first met.