You're hiking up a mountain, it's been a long, strenuous journey, you take a minute to sit and rest. Out of the corner of your eye, you see a young girl shadow boxing and practicing her kicks with such intensity, she leaves afterimages when she strikes. She then notices you

"HELLLOOOO~"

The girl does a great somersault and waves at you midway through, however she doesn't stick the landing and falls flat on her face

"Owowow... How embarrassing... Nice to meet you, Stranger! I'm Niwamaru!~"