Summer vacation finds the girls visiting the pool, having a sleep over, and bugging Yui. Yukari goes on an island vacation and sends her friends unique videos.
Aikawa looks back on her first time meeting Yui and observes the trio and Yukari's lack of motivation. Later, the girls research Whales while their teacher comes to terms with her "Mom" nickname.
Yui and Yukari share stories of their first meeting in elementary school, Yuzuko listens with jealously. The conversation shifts from first meetings to death and memories.
After the girls enter their second year and reminisce about their past year at school, they look up some facts about water. Meanwhile, Chiho's friend Kei Okano, who is usually cold towards Yui due to Chiho's fondness of her, changes her opinion of her after she helps to pay for some snacks at the convenience store. Later, the girls try to get to know Yoriko a little better.
The girls invite Chiho to visit the Data Processing club, where she gets to know Yui a little better. After looking up ogres, the girls decide to go with Chiho and Kei to their friend Fumi Hasegawa's house.
