Misumaruka Koukoku Monogatari

Mahiro, the lazy prince of the Mismarca Kingdom, avoids both his studies and sword training, preferring to stay up late playing. His imperial bodyguard, Pariel, regularly scolds him for neglecting his duties. As an elite squad from the Demonic Kingdom of Granmarsenal approaches, Mismarca’s vassals call for an all-out war. The squad is led by Lunas, a warrior princess and Granmarsenal’s third princess. Amid the calls to fight, one man suggests they talk instead. What fate awaits the kingdom and its supposedly useless prince?