12.3 Story Mode Lunatic 1CC with Sanae.
I went through the penultimate Spellcard, seeing it for the first time on Lunatic, getting irritated like never before because of the camera that I hate so much, cost me such an absurd amount of health, wasn't even remotely close to being funny. I still lived through it and figured "Whatever, at least I've got all Spellcards unlocked now!", proceeded to live through the first wave of the last Spellcard, then ran out of luck, but still content with the result of the run. Was already pressing down to get to Spell Practice asap, when suddenly, uh, the ending popped up.
I knew you didn't have to beat the Spellcard in time to get the clear, but I didn't know you didn't even have to survive it.
Regardless, seeing how I'm being absolutely slaughtered by the Spellcard in Spell Practice, I'm really glad it's that way. Whee, time to finally take a look at the Overdrives in TD!