I'm in the same place. Three days of fighting Dark Lord with nothing to show for it. Haven't let my energy bar max out since event started, spent all my kobans on recharging. Quite annoyed. Given it's a legendary girl, something like completing a series of daily missions like the normal event girls makes more sense. Or increasing the chance of drop for each time failed. As it stands, something that should have been exciting, the introduction of a new legendary girl, has just left me feeling annoyed.