Touhou 6 - The Embodiment of Scarlet Devil - Stage 6 Lunatic No Deaths

Now Donut won’t have to feel lonely anymore. o/ EoSD stage 6 is quiet possibly one of the hardest stages in all of Touhou to do no deaths. Remilia is one of the hardest bosses in the series (lunatic Remilia is harder than Flandre IMO). Another reason is because of the massive amount of luck some attacks require. See Vampire Illusion.