Sakuta Azusagawa is attending his third and last term as a second-year high school student. There are only a few days left to spend together at Minegahara High School with Mai Sakurajima, a third-year student and Sakuta’s girlfriend. Meanwhile, his younger sister Kaede, who has loved her house for many years, reveals a secret to Sakuta that she has never shared with anyone.

"I want to go to big brother’s school."

This is a big decision for Kaede.

Although Sakuta knows this is a difficult decision for her, he decides to gently support her.

Little Kaede’s feelings are entrusted to Kaede. This is a story about these two as they take a step into the future.

[Source: official English website]