I didn't get Levitya either.

I did exactly the same as most of you did; started off with 20 combativity, never let the bar fill up to 20 until the event ended, and in the last few hours I used a couple of hundred Kobans too. I would have kept spending them too, but since I had read all the comments on this forum, I decided it would be a waste and just stopped.

I don't think the mechanic for increased drop chance if you don't get a girl and don't lose fights is working at all, because I had Dark Lord maxed out at level 30, and never lost a single fight with him in the process (or any other bosses, if the win count for all bosses is still there). You need to look into this, devs.

Very dissappointed.