The story centers around Amaya, Iwasawa, and Uehara—three "annoying, spirited high school girls with zero motivation"—and their classmates. Their daily life is "what happens when there is nothing happening."
As homeroom begins, Ms. Sumiko Yamashita gives her class a surprise pop quiz which contains the question, "What is your teacher's name?" Mei Yanase, being the only one to answer correctly, is made the class representative, while Kanaka is made the MVP for her answer "Hikaru Jinguji", which Sumiko feels suits her better as a name. Afterwards, at lunch, the girls once again discuss nicknames, with Kanaka settling on calling Ayuko by the nickname: "Yukon". After school, Ayuko tries to get Ms. Yamashita's attention by calling her "Jinguji-sensei", but switches to "Yamashita-sensei" when she doesn't get a response.
Ayuko Uehara spends her last day of summer by going around town for a bit. She soon encounters two girls at a taiyaki bar, Saki Iwasawa and Kanaka Amaya. Kanaka excitedly shows some dancing theatrics with her taiyaki to Saki, before she accidentally bumps into Ayuko, subsequently knocking her taiyaki over. Kanaka apologizes by offering Saki's spicy taiyaki and they both run off. As Ayuko bites into Saki's taiyaki, she overhears that they are starting high school the following day and remarks that she is as well. That night Ayuko ponders that her school uniform is a bit to large for her but that she'll probably grow into it.