Hitogata Ruins

In ancient times, in a feudal land, seven clans battle for supremacy and the royal family's favor. There is a tale of legendary weapons called "Makurium", but their existence is considered that of myth. Perhaps to find a way to cease the warring without bloodshed, the princess decrees that she will marry whoever of the seven clans finds any real proof of these weapons. This of course puts those in power in an uproar as they scramble to find them. However, it just so turns out that our hero stumbles upon such a weapon...in the shape of a girl?! Well, if getting an audience and proving her worth isn't enough, all the clansmen are rearing to invade one another again.

[From White Masq]