Touhou Mecha: Hell's Rising

Chireiden and Parsia, two territories locked in the depths of Gensoukyo's underworld, are consumed by war. To tip the scales, the hell raven Utsuho Reiuji ventures into the Remains of Blazing Hell to seize the power of the sun god Yatagarasu. This power will let her pilot the AM Yatagarasu, a mecha of devastating might. But the sun god is far from the only entity waiting within those hellish ruins...