Hachiman grows restless as the end of summer approaches while at the same time babysitting Yui's dog Sablé. As thanks Yui invites Komachi and Hachiman to the upcoming Fireworks Festival, however Komachi slyly declines the invitation, instead pressuring Hachiman to go with Yui. On the day of the festival, Hachiman suppresses his human instincts of being with Yui with his own warped logic. As they shop for Komachi's items, they encounter Minami Sagami and her clique who innocently tease Yui for attending with Hachiman by making the Festival out to be a girls-only social event. As the fireworks start, Yui remarks on Hachiman's thoughtfulness, while running into Haruno. As the three sit and watch the fireworks, they discuss their relationships with Yukino, with Haruno lamenting that things never seem to work out for Yukino. At the end of the festival, Haruno offers to take Hachiman and Yui home in her limo, although they end up declining despite Hachiman's words that he isn't bothered by the past accident. Later, Yui asks Hachiman if Yukino had ever told him about the accident to which he negatively replies, stating that they should not dwell on matters that Yukino would rather not discuss. Yui retorts that she would like the three of them to get to know each other better, hence be closer friends and suggests that herself and Hachiman would have been friends even if the accident hadn't occurred. Although Hachiman rejects Yui's theory on the basis of cause and effect. As the discussion takes a romantic turn, Yui is interrupted by a call from her mother and hurries off. School resumes the next day and Hachiman and Yukino run into each other. Finally Hachiman ends with a monologue explaining that he hates himself for believing his own ideal of Yukino, because just like any ordinary person, she too lies.