[White Manju Bun]

Originally Posted by LKK

That's a very good question. It seems to be a contradiction within the story. And that may be the answer. The novelist made a mistake. However, there's also another possibility.

Spoiler:

This theory is based on the assumption that Kazuya Shibuya is not his real name.

Things to remember:
1) The zuso can be effective without knowing the specific person's name. Remember the hitogata in the desk? The curse was on whoever sat at the desk not on a specific person. That's one of the clues Naru uses to decide sensei is guilty not Kansei. Kansei would know the name of the student sitting at the desk. Sensei would not.

2) When Naru looks at the hitogatas found in the manhole, he says that they found his and Mai's. We see Mai's hitogata with her (English) name on it. But we never see Naru's.

3) While the anime has Naru telling sensei his name, in the manga, he doesn't. In the manga, Naru says that only the principle knew his name.

4) In the manga hospital scene, Naru never says where he thinks sensei got his name from. The assumption is that the principle told sensei his name, but Naru never actually says that. In fact, Naru never says sensei used his name on the hitogata.

Naru: I didn't tell my full name to anyone at the school. I believe the principal is the only person who knew it. And the principal doesn't know Mai's name. If Kansai-san knew our names, you'd have had a chance to have gotten them from her.

Putting all this together, here's my theory ... Naru's hitogata didn't say Kazuya Shibuya. Naru's hitogata said something like "the boss of the ghost hunters" or some other descriptive phrase. A description of his position would be just as effective as his name if I understand the hitogata used in the desk correctly.

Remember that my theory is based on the idea that Kazuya Shibuya isn't Naru's real name. If Naru's hitogata actually said Kazuya Shibuya, it wouldn't have been effective against him if Shibuya isn't his real name. But a hitogata that used a description of him would be effective whatever Naru's real name is.

I developed this theory just tonight. It may need refining. Feel free to poke holes in it. In fact, you find holes in my logic, please poke at them. This is a question that definitely needs explanation.

~Look's for places to poke~ hmmmm

Spoiler:

Yeah I totally agree that Shibuya Kazuya isnt his real name and we pretty much got a massive hint of that in vol 1/epi 1.
What doesnt make a lot of sense to me and why I feel that the no name on the door is just how is, is based on that fact that if the sensei was trying to curse him at this point, he's already figured out that its her. What would be her purpose to try it again? (Im basing this on the manga facts since sensei doesnt try to curse him again in the manga, only in the anime ver, thats why I didnt like the animation ver of this since in that he directly tells sensei his name, which isnt like him...anyways). Im sure there's a better a explanation to why his name wasnt on the door but right now Im sticking to the "thats just how he is" theory.
I agree that the Hitogata probably didnt say Shibuya Kazuya but probably something like what LKK said, boss or something like that.

Gah my reasoning skills are dropping
~tries to sit like L~