Blade of the Moon Princess, Vol. 4 by Tatsuya Endo

Defiant and brash, Princess Kaguya Takenouchi isn’t the ideal heir to the moon's Silver Court. But when villainous usurpers attack her people, she must rise to the occasion and protect the imperial line.

Defiant and vulgar, Princess Kaguya Takenouchi is not the heir to the moon’s Silver Court that her mother’s retainers had hoped for. But when the empress falls ill during a wave of terrorist attacks, Kaguya resolves to do right by her people and rise to the occasion.

After Kaguya has a chance meeting with Toyo, the younger sister of Kiruhito Matsunouchi, the pair travel to the capital in order to clear the name of Kaguya’s mother. Meanwhile, Kiruhito learns the truth behind the devastating incident 16 years ago and vows to kill his emperor. New alliances lead to big changes!