The White Cat's Revenge as Plotted from the Dragon King's Lap, Vol. 4

Ruri, racked with guilt for deceiving the kind people of the Dracodom about her true form, sinks into despondency and lies around doing nothing all day...until she hears Nadasha is finally sending its armies to attack—and Asahi will be fighting on its side. Ruri convinces Jade to let her go to the battlefield to see for herself, and though the draconian soldiers are mostly just batting the humans around like cats playing with mice, Asahi has the means to turn this mock battle into a true tragedy...

Volume 4 of The White Cat's Revenge as Plotted from the Dragon King's Lap manga series by Aki Aki.