about a little boy and a little girl

Once, not so very long ago, there was a crowded street in a crowded city where many people lived so close together that their houses were connected, there lived a little boy and a little girl. the boy was called jack, the girl rin. although rin was three years older, the two were always together: on school mornings jack would crawl through his rooftop window and use a screwdriver to open the latch on on the top window of the greenhouse where rin and her mother lived with the flowers.