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Asahi and Nagisa were invited by Youko, Shimada, Oka, and Sakura (respectively) to the Summer Festival; however, Youko tricked them into together on them spending an exciting time 'alone together'.
Episodes
1I'll Confess! 2I'll Keep This Secret! 3Beware Childhood Friends! 4Help the Class Rep! 5Let's Go on a... Date? 6Beware of the Wolf Man! 7Let's Get Sexy! 8Let's Save the World! 9Let's Put On Our Swimsuits! 10Let's Be Honest! 11Let's Go to the Summer Festival! 12Let's Stop This Confession! 13Let's Go Home Together!