Episode 4: "1st Period - 'Framed' / 2nd Period - 'Comparing Heights' / 3rd Period - 'Three-Legged Race' / 4th Period - 'Pinky Promise - Part 1' / 5th Period 'Pinky Promise - Part 2'"
When Megumi misplaces her bloomers, the girls blame the boys theft and begin searching their bags and person. Chika and Ryōta bet on who's the tallest. Even though Ryouta wins in overall height, he sulks over having short legs. Ryōta and Kōji decide to have a duel to see who could win the three-legged race at the sports festival. Ryōta remembers a pinky promise he and Chika had when they were little to get married when they grew up. Chika too remembers a similar promise. Ryōta misunderstands what memory Chika recalls, however they make up in the end.
