Ishigami Senki

Synopsis:

The northeastern region of the Hiwazu island nation is Mizuho territory. On the big day of his senior sibling, Ruler Saku, Ukano Isaza, the more youthful sibling of the master, meets a lady of the "stone individuals" who should have been told in a fantasy, and is compelled to make an agreement with her...? Iroha Kohinata's war romance has just begun!