As She Fades, a Dark Night Falls, and the Rain Begins to Pour

After a tumultuous visit to her hometown, Yoshino and Kirishima return from Osaka to the Miyama residence in Tokyo. They thought their usual daily life would resume as always, but from the very next day, Yoshino starts ignoring Kirishima. She alters her schedule to avoid him when going to school, ignores him when he speaks, and offers no response even when he cooks for her. A rare moment of distress overtakes Kirishima, who sits in the rain in front of the annex where Yoshino is staying. What is the reason Yoshino continues to ignore Kirishima...?