Iroha is a first-year high school student who finds it difficult to talk to others. Even though it's been about two months since she started high school, she still hasn't had a proper conversation with any of her classmates. During every break, she quietly slips out of the classroom and heads to the courtyard by the old school building. She does this to meet and talk with an upperclassman she first met at the library while studying for exams. This upperclassman, who is a year older, has become a source of support for Iroha. However, the two of them share a secret...