One, Two, Threesome! (S01E12)

Following Keita’s graduation, Ako and Riko arrive only to discover that they missed the chance to snag the second button from his blazer. Ignoring Keita’s protests, they decide to hold a draw for consolation prizes, including Mikazuki and Miharu. Ako’s plan backfires when she ends up with Keita’s shirt collar, while Mikazuki wins the chance for Keita to flip her skirt, unaware she’s not wearing any underwear. Riko gets a chance to kiss Keita but freezes in embarrassment. Miharu is left with a prize to spend ten minutes alone with Keita, which turns awkward after a slip leads to a compromising moment, prompting Ako and Riko to jump to conclusions. Later, as Keita drifts off to sleep, Ako and Riko make their move, leaving him with bizarre dreams.