Crash of blades: A forgotten face

Nio. Just a regular teenager. Or so she assumed. Living on such small Islands meant that everybody knew each other. And almost every corner had been explored. No mystery, no secret treasure nothing. And that bored her. However, she would recall moments of a young girl and boy playing together. But the boy, she could never recognise. He was certainly no Islander. Then news of a missing child arises. She must investigate...