Hachiman is at home growing restless as the end of summer approaches. Yui shows up to get her dog Sablé, whom Komachi is dog-sitting. As thanks, Yui invites Komachi and Hachiman to the upcoming Fireworks Festival, however Komachi slyly declines the invitation, instead pressuring Hachiman to accompany Yui to buy her things from a shopping list instead.
On the day of the festival, Hachiman continuously convinces himself that Yui is just being a nice girl and that her actions don't mean anything. As they shop for Komachi's items, they encounter Minami Sagami and her clique who tease Yui for attending with Hachiman. While Yui is chatting with Minami, Hachiman heads off to buy the food that Yui wanted. When Yui returns she remarks on Hachiman's thoughtfulness.
As the fireworks start hachiman and Yui are looking for a good place to sit and watch. They happen to be noticed by Haruno Yukinoshita. Who invites them to the VIP section, as she is there representing her father. As the three sit and watch the fireworks, they discuss their relationships with Yukino, with Haruno commenting on Yui and Hachiman, while lamenting that things never seem to work out for Yukino. And Yui strongly reiterates her friendship with Yukino.
After the fireworks, Haruno offers to take Hachiman and Yui home in her limo, explaining that you can't even see the damage anymore (from the accident). Hachiman and Yui are hesitant to accept, as its the car that hit Hachiman. They end up declining despite Hachiman's words that he isn't bothered by the past accident.
On the way home, 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. She also 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 Yui steers the conversation towards romantic feelings, Yui is interrupted by a call from her mother though intent on continuing, Hachiman tells her to answer and she hurries off.
School resumes the next day, Hachiman and Yukino run into each other on the stairs. They walk for and talk for a bit as Yukino mentions the meeting that he had with her sister as he confirms it. Yukino then realizes that Hachiman now knows the full truth about his accident and is nervously about to tell Hachiman something (possibly regarding it), but he cuts her off, asking about the Service Club opening at its usual time which she confirms and he leaves after she nervously confirms the answer.
As they walk away, Hachiman ends with an internal monologue explaining that he hates himself for believing his own forced perspective/idea of Yukino, because just like any ordinary person, she too lies.
- Haruno knew about the incident with Hachiman.
- It is confirmed by Haruno that it was Yukino's limo that struck him and Yukino withheld this information.
- Similar to Yui, Hachiman distances himself from her as well for not telling him.
- Hachiman is revealed to know of his sister's true motives to set him up with girls.
- Yui attempts to confess her feelings for Hachiman but some events cut her off and she leaves.
- However, it is implied she would save her confession for another time.
- From his non-surprised reaction at her attempt, it is suggestion that he knows of Yui's feelings for him and chooses not to acknowledge them.