My friend's mother

My son Ryota has been bringing Hashimoto, who has recently become friends with me at my part-time job, often to my house. Her mother, Ayaka, was very happy and relieved to see Ryota, who had never had many friends before, giving her heart to Hashimoto. Both the parent and child gradually become friends with Hashimoto, but Hashimoto's true goal is his mother's Ayaka...