Satomi Yamamoto attends Keishin Girls’ High School. Due to her father’s transfer, she was gloating that she could enjoy a free and carefree life alone, but her new teacher, Ayako Shimada, will be lodging in her place. From meals to baths, toilets, and even inside school, she is nagging and crippled. One day, Satomi confesses her feelings by hiding a love letter in the shoebox of her admired student, Shoko Himeno. On the other hand, Ayako begins to worry that Satomi will leave her..