Megumi stares at her uneaten lunch one day due to worries about her own weight. Out of concern, Ryöta investigates and discovers that the scale in the nurses office is improperly calibrated. While still dieting, Megumi's willpower is put to the test when Kazumi decides to record Megumi's reaction in her observation diary to various foods as well as experimenting to see if pain or laughter can displace hunger. At the end of class, Chika and Megumi decide to compare heights and find out that Chika has a slight height advantage. Because it was mentioned, Natsumi and Ryöta begin to worry about their own heights. To spite Ryöta, Köji proposes that he compare heights with Chika ending in stalemate between Ryöta's win in overall height and Chika's longer legs. Natsumi begins to binge on milk in an attempt to develop her breasts, eliciting the awe of her classmates due to the volume and speed she can intake. This prompts Ryöta, goaded by Köji, to engage in a milk-drinking contest which he loses.