Summer begins at last! Izumi-kun joins Shikimori-san and their friends in deciding what they'll all do together over summer break. They decide to go to the river, but is the combination of a river and Izumi-kun's bad luck too dangerous? Then Shikimori-san says something amazingly cool... After some discussion, they all head to the mall together. Shikimori-san seems disappointed when Izumi-kun says he won't wear a swimsuit at the river. She says she won't wear one either, but then Izumi-kun does something that lights a fire in her...

Summer break is here at last! Izumi-kun and his friends arrive at the river, where they get started with a barbecue. As they divide up the prep work, everyone suddenly feels very anxious... because Izumi-kun has picked up a kitchen knife! Even Shikimori-san's eyes grow wide... but she's once again charmed by Izumi-kun and his ability to do just about anything. After the barbecue, they all decide to play in the river, but Izumi-kun gets into some trouble...

Izumi-kun is out sick from school. Shikimori-san learns that Izumi-kun asked Inuzuka to take notes for him, causing her to glare daggers at Inuzuka in envy. Yes, Shikimori-san sees Inuzuka as a rival. When the two of them go to Izumi-kun's house together to take the notes to him, Hachimitsu secretly follows them, and one little word that slips from Shikimori-san's mouth leads her to deduce the reason for this perceived rivalry... On another day, Shikimori-san is at the mall with Nekozaki, where they run into Kamiya-san and invite her to hang out with them.

Preparations are underway for the school's athletic festival. Izumi-kun was hoping to avoid being placed in the highlight event, the boys and girls mixed relay, but unluckily enough, that's exactly what he's chosen for. But Shikimori-san and all of their friends end up on the relay team with him, so he feels like it'll actually be fun this time. The gang wastes no time starting to practice for the race, but it doesn't go so well for Izumi-kun and Hachimitsu. They refuse to give up, continuing to practice until the day of the festival comes. Hachimitsu seems to be in very low spirits before their event starts...