The world is in the midst of an unprecedented Hyakunin Isshu boom. Yasuo, who lives next door, visits the Kayama family to ask Natsuko, who is familiar with Hyakunin Isshu, for instruction. Natsuko and Yasuo's training continues from that day on. One day, as Yasuo is about to pick up a card, he notices something. Natsuko is not wearing any underwear! Yasuo cannot hide his shock at this sudden turn of events, but Natsuko and Yasuo's no-panties Hyakunin Isshu playing around with Yasuo's gaze continues to escalate day by day...