Final answer:
In the story 'The Sound of Waves', Henry thinks he sees Keiko's mother when he looks across the street.
Step-by-step explanation:
In the story 'The Sound of Waves' by Yukio Mishima, when Henry looks across the street, he sees Keiko's mother. Keiko's father had died, and her mother is left to take care of her. Henry sees her standing on the porch, watching him from across the street.