1) I don't think Kujo would know for sure what her mother was up to. Whether she really did leave the sect or not.. (and if so, WHEN exactly she left.. 2 years ago or before Kujo's birth?) whether she committed suicide because the cult leader was captured/the terrorist attack failed or because she realized she was in love/had a relationship with an actual terrorist (Or maybe because J was already involved with the terrorist attack 2 years ago? And she thought she failed as a mother? I don't remember was J involved 2 years ago?) As for Kujo blaming his grandfather? He doesn't really have anyone else to blame. Maybe he was blaming him for letting the mother getting involved with the sect in the first place?
2) Well according to the video the bomb went off before Maya entering the church, right? So she wasn't there during the actual explosion.. But I really have no idea how this works..
3) That's a good question. I doubt they did a DNA test, though it's not impossible, even if in secret.
4) I think K wanted to f*** with Takagi's head by getting as close to him as possible, making him care for her. And mind you, they did end up using Takagi to free the cult leader by kidnapping them and that's because K was close enough to Takagi to be with them and to be able to inject Hide with the virus somehow and control the situation more or less (she almost managed to get rid of the anti-virus (the pen), too, didn't she?).
5) What's wrong with expressionless? A psycho won't necessarily will run around screaming she's mad. I think there was nothing wrong with her being expressionless. Sure K's character was a bit colorless compared to other villains in the drama, but I don't think it was the fault of the actress.
6) I guess the father kept Kujo because he wasn't the son of the cult leader (at least the grandfather seemed to assume so, and everyone else, as well) In a position like his, he cannot afford to have any kind of relations to terrorists. I think she worked for the grandfather, yes. And I think the grandfather wanted to actually protect/help J (and make the terrorist attempt fail again). And get his hands on the bombs?
7) Because he wanted to talk to her and understand her reasons (I guess he knew once K is captured, he won't have the chance to do that). Takagi considered her a friend and for the longest time he thought his father betrayed him but turned out he didn't, so maybe he thought K had a good reason, too.
8.) I wasn't entirely amazed by the efficiency of THIRD-I throughout the whole series, lol.. the only probable answer I can think of is that they did not have any other options and because she did sort of prove she turned against the terrorists.
9) I'd really like to know what was J's original plan, indeed. Because he wasn't buying the we-are-going-to-be-gods crap and he didn't seem to be emotionally attached to the father (ok well, he hated him I guess). I don't know what was his plan when it comes to the father but I think he played along because without the sect members' help J was much less efficient..
10) haha, that was kind of lollable. sure it was because they wanted us to think K is Kujo and all that stuff (so it was basically a waste of time), but he should have killed her the moment he had a chance to do so, indeed. I don't see why he'd go through the trouble to kill her in the church. Sure K had a lot to do with ppl dying in the church and if she died there, too, it would have been very epic, lol.. Maybe it was just playing with K, torturing her here and there, to initially learn about the whereabouts of the bomb? Killing K would not necessarily mean the end of the threat. There's always J you can count on.
11) I think K believed in what the sect believed in and maybe she thought they were running out of time, anyway and Maya didn't have the time to get far before the explosion, so she'd die anyway. Maybe she thought she was being merciful, maybe she thought she owned Maya something.. idk.
12) If K dies before the countdown finishes, the bomb explodes. She told Takagi the opposite to f*** with him one more time. I'm not sure what was she expecting, whether Takagi would shoot her or not.. (I think she knew he wouldn't) but I guess being shot to death seems to be a better way to go then what (she thought) was coming. On the other hand, there's the possibility she knew that if J (and Maya) betrayed her it means there won't be any explosion. So she toyed with Takagi's head a bit then she prob would have shot him and get away... Or she thought he would kill her and that's once again better than whatever she thought that was coming.
I think she asked because I don't think she had anyone close to her that she was sure they would miss her (or feel anything) if she died. The drama had a bunch of kids/younger ppl on the show with fucked up childhood and parent/trust issues and she was definitely one of them. If Takagi said he was happy, K would go knowing she really was alone (and that she managed to corrupt Takagi).. with the opposite happening, maybe K managed to get some peace before going.. or faith in humanity? (lol), idk..
13) They originally planned to get out of the city in time but since J never went back to K, and K didn't give up on him and waited, they ran out of time.
14) I think that was because she didn't want Yukiko to be just a nameless faceless victim, she wanted everyone to know it was actually a person with a name and with a life. Probably because how the blog readers reacted to her last entry. It almost seemed like there really wasn't a Yasuda Yukiko. Choosing her as the first victim I think it kind of shows where the terrorist were coming from, lol. What a fucked up thing that she was nothing more than a few entries on a blog yet so much more.