At least it's not Touma this time. Though it's really unfortunate for Walpurgis.
To be fair, as I mentioned in the comments for one of this author's previous works, Walpurgisnacht is really a horrible match-up for Touma. It can fly, so him touching it with Imagine Breaker isn't going to be so easy, and it can levitate and chuck buildings at him, which is something his right hand can't negate. All that and he has to somehow reach it while being attacked by it's army of familiars.
So, really, Accelerator is the best bet for defeating the strongest of all Witches (that or maybe Fiamma or Aleister, but I can't see either one giving a damn about Mitikihara).
