Kunon's latest magic tool is the talk of the town back in Hughlia, and the government has dispatched Zeonly to secure exclusive rights to it. But when the eccentric student-teacher pair reunites, they quickly blow off official business and start investigating Kunon's Glass Eye. Zeonly hasn't come alone, either—he's brought Mirika, Kunon's fiancée, who he hasn't seen in over a year. Between nighttime excursions and long-awaited dates, Kunon has barely a moment to spare. But soon it's time to begin learning about biomancy in preparation for his joint experiment with Shilto. What new wonders will Kunon discover when he tries his hand at this mysterious, forbidden art?