Kimishima Yuuko

A married woman who lives next door, has known the main character since she was a child. To my mother, she is a close neighbor, almost like a “fellow wife”.

She is one of the few people who knows what is going on at the main character's house. She masturbates heavily at night, probably because her husband is on a long business trip.

Since the main character's room is next to hers across the wall, her voice often leaks out. He struggles, as he tries to concentrate on his studies while wearing headphones.