Again, try remapping, as suggested earlier.
And yes, Yuyuko is the best boss. Well, except maybe the fighting game bosses and Futo from TD. Only a stage 5 boss, I know, but some of those spell cards are just far too much fun.
Edit: I should probably mention that a fiery loathing for Youmu and the Prismrivers is perfectly normal. The only cure is fighting Shou (or failing that, Rin) over and over. To give you some perspective.