Full Metal Daemon Muramasa (Soukou Akki Muramasa - 装甲悪鬼村正)
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GOG Store page (GOG version uncensor patch)
SUMMARY
This is not a story of heroes.
Since time immemorial, warriors called musha have ruled the battlefield, granted supernatural power by their enchanted suits of armor - tsurugi.
Minato Kageaki is one such musha, driven by duty to don his crimson armor and challenge the greatest evils of an age. But though madmen and tyrants fall to his blade, never will he claim that his battle is right.
For the tsurugi he wields is cursed Muramasa, which five centuries ago brought ruin to the land, and innocent blood is the price it demands in exchange for its terrible might.
"Where there are demons, I slay them. Where there are saints, I slay them."
These words are an oath, the unbreakable Law binding him to his armor. But they also tell the story of his past, and of the future to come.
ENDING GUIDELINE
By default, Full Metal Daemon Muramasa has 3 routes, 2 of them initially unlocked (Hero and Nemesis). Completing both routes allow you to access the true end route: Conqueror.
Other than that, you can complete any of those routes by any order. However, it is recommended for you to go through your first playthrough blind, so you'll be able to get the full feel of this story. To give you some hints:
ROUTE GUIDELINE
Hero Route [Ichijou Ayane end]
Nemesis Route [Kanae Ohtori end]
Conqueror Route [Evil Demon True End]
Conqueror Route [Demon End]
Conqueror Route [Devil End - Chachamaru]
Attribution
Guide from Otaku Lair - where this walkthrough is based and omitted
Seiya-Saga - guide in Japanese