Hooked - Asako Yuzuki

Eriko's life appears perfect, but beneath her flawless surface she is wracked by loneliness. She becomes fascinated with a blog written by a housewife, Shoko, whose posts about eating convenience store food and her untidy home are the opposite of the typical Japanese housewife's manicured lifestyle. When Eriko tracks Shoko down at her favourite restaurant and befriends her, Shoko is at first charmed by her new companion. But as Eriko's obsession with Shoko deepens, her behaviour becomes increasingly possessive. By the author of cult bestseller Butter.