>>48141530(You) are a young 1X-year old boy on a family camping trip to a national park.
On a day hike, you accidentally get separated from your parents, but luckily as dusk nears, AZKi finds you. She's on a roadtrip to see more landmarks of Japan, and she offers to let you stay the night in her tent.
However, this onee-san is a more dangerous predator than the beasts outside...