Going by the accounts I have read from people who were there, it sounds very believable and that’s definitely his signature in the picture that Xelyna posted. Having said that, it sounds nothing like an official visit. Apparently Mana was wearing casual clothes (the well-known black shirt, black trousers, black platform boots, black hat, black sunglasses combination) and no makeup. He also apparently acted very shy and they only had blank paper for the autographs. Would he turn up at an official autograph event without makeup, unshaved (!) and in plain clothes? I think not.
He arrived at 5pm on Saturday afternoon when there were only about 14 people left in the shop and only stayed 30 minutes. The shop staff apparently received 1 hour notice and instead of clearing the shop they told the few people who were still there to stay on because Mana was coming. If that was really him then I think it was another one of his ad hoc decisions to mingle with mere mortals thinking he would not be recognized (like he did at the Japan Expo – with similar results). Considering how paranoid he is about his image I think he probably enjoyed the contact with the fans but not necessarily the circumstances. I don't think he expected having to sign autographs - looking the way he did.
Apparently when Mana first arrived at Neotokyo he spent some time looking around the shop, specifically the glass cabinet in which the M10M and MM stuff is displayed. Neotokyo is not only an anime shop but also sells tons of JRock CDs and merchandise. They are the official distributor for M10M merchandise in Europe and they also sell and distribute the European pressings of M10M (and soon MM) music by Mabell. Earlier this year they were in negotiations about selling MMM clothes in their shops (I emailed them to confirm that at the time) but there wasn’t enough interest from potential customers (too expensive) and so eventually Mana decided to sell MMM over the internet instead. I think he really just wanted to check out the shop that is selling his music in Germany and got dragged into an autograph session instead.
What I would like to know is: he must have been in Berlin to discuss business matters. What could that have been? His music is already being sold there via Neotokyo and his clothes are sold over the internet now. Could he have been checking out suitable venues for his European tour? I hope he is not bringing his European tour forward - now that I have taken time off work for Dis Inferno 3 I have no holiday left until January (and no money).