The world is in the midst of an unprecedented 'Hyakunin Isshu' boom. Yasuo, who lives next door, visits the Koyama household to seek guidance from Natsuko, who is familiar with Hyakunin Isshu. From that day on, Natsuko and Yasuo's training continues. One day, while trying to take a card, Yasuo notices something. The fact that Natsuko isn't wearing any panties! Unable to hide his surprise at the sudden turn of events, Yasuo struggles to compose himself. However, Natsuko seems to be toying with Yasuo's gaze, and their no-panties Hyakunin Isshu training escalates day by day...
