*Its probably been almost 4 years since i read this so the accuracy of my info is probably questionable. The parts that im pretty sure about: the main character is male, has two left hands, wears a kimono(or something of the sort) with long sleeves to cover his hands, weilds katana or some kind of blade. Set in fantasy traditional japan. The parts im not sure about: the main charcter weilds two swords, his kimono is striped, there is a female lead he meets in the first chapter, neither of the main charcters hands are actually his, there were butterflies. I know its not much to go on but ive trying to find this one manga sunce i forgot it and couldnt. Hoping someone can help!
from what I got from your description, I think this one comes to mind Mononote: Edo Kiketsu Ninja Emaki