Ao is utterly apathetic about the upcoming sports festival, until she learns Takumi will be on the cheer squad, and dedicates herself to training hard for the 800m run so she can experience the joy of being cheered on by the guy she likes.
Kudos for the show finally portraying these two as a comfortable, easygoing couple, even if they’re not 100% officially “dating;” it’s nice to see Ao not only publicly acknowledging her interest in Takumi (already well known in her class) but contributing to him making the decision to participate.
Of course, there has to be a conflict of some kind (beyond winning the race) and it comes in the form of her father, who has embarrassed her at every level of her education during the sports festival. When she bans him from this one, he bans her from ever moving out, and the two.
Yet, despite their fight, and despite the fact Ao made sure Yabe increased his workload tenfold, her father still makes it to the festival. Ao notices him just after having a talk with Takumi, who tells her he’s probably not that upset over their fight and that she should just talk to him.
While Pops gets to apologize, and explains his presence as having done all the work put before him with maximum efficiency, all so he could watch her compete, Ao is about to apologize back, but it’s time to run. Her dad joins Takumi and the cheer squad, and Ao takes the lead, but starts flagging in the home stretch.
This is when Pops fulfills Ao’s worst fear, yelling for her to hold onto her “G-cups” so she can run faster. This embarrasses her, Takumi, the cheer squad, and also freezes the other runners, as well as energizes Ao into finding her second wind and finishing first. But her Pops doesn’t escape a beatdown for his raunchy words.
Of course all of this could have been avoided if the show remembered there are these things called sports bras, to be used while running, jumping, and doing other athletic things!