High-school elf

High elf girlfriend

You are my hero

Came from another world to the modern world in search of a hero

Was told by the high priest that the first person she encountered after her transfer to another world was the hero, met an elementary school boy

Had intended to take him back to her world right away, but ended up living with him in the modern world for a while until he reached an appropriate age

Had dressed in conventional elf-like attire when she first arrived

She borrows (is forced to wear) clothes from the hero's mother, who has a hobby of cosplay

White stockings & garterbelt

Her hair reaches her butt