Chiaki is down in the dumps at the upcoming stewardship of the pool and decides to enliven things by challenging everybody to a game of tag with the »it« person having the garden hose. Makoto stealing the hose and Chiaki's retaliation sparks a three-way water fight with Uchida and Yoshino that obfuscates the issue of Chiaki not being able to swim and that the compensatory computation thereof backfiring on Chiaki. The next arc is a snapshot of Kana's computations of the intermediate school social ambiance in terms of a outing to a public pool followed by the computation crash wrought upon Fujioka regarding appropriate male contact with females and the aftermath thereof. Touma demonstrates her perspective on the issue only to find that male-to-male contact is much more straightforward and has greater latitude.