Ame to Kimi no Mukou

Yuka Kano, a 27-year-old junior high school teacher, has never dated a man in her life. One rainy afternoon, whilst tutoring one of her students, Yuka suddenly finds herself being kissed on the cheek by Aki Madarame. Aki confesses that in order to be alone with Yuka, she purposely failed the test. Confused as to why her student would do such a thing, Yuka decides to visit Aki at her house, where she finds out the ugly truth...

(Source: Digital Manga Publishing)