>>125463I'm not so sure. Pt. 20 went out of its way to show Dryad with the same silhouette as the mystery feeder, so unless Belt-Buster is using a generic silhouette for both Dryad and the Feeder, the implication is they are one and the same. And considering Kai was in the chatroom at the same time as Dryad and we saw where he was, he can't be Dryad too. There's also the fact that when Mari approached him asking about Nikolai, he just expressed confusion, whereas if he was the feeder, he'd not likely be confused since that seems to be their plan. Even when Mari rushed in to save Nikolai during his anxiety attack while Kai watched, Kai's only thought was about how she didn't need his help after all like she claimed, rather than anything like "All According to Keikaku".
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I'm not saying Kai isn't involved. He probably is to some extent, since he goes out of his way to tell Nikolai not to let Emma know about their "investigation", and is the one who convinced them to go to Elijas' party which is where Tine got exposed while having a convenient excuse so he doesn't have to go.
I think he is indeed related to the glasses girl, who is also Tine's ex-bully victim Sara and Dryad's identity. Maybe she's his sister or an old friend, but he was specifically involved so as to expose Tine and possibly find a way to introduce Sara to Nikolai, following a similar idea to Elijas introducing Nikolai to Anne. It's just his extent of the plan was getting Nikolai invested enough in Elijas to go to his party so he could see Tine be exposed. After that, his only role is to be a passive observer.
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After all, the common denominator in this whole ordeal appears to be Tine. Lene used to be in Tine's friend group but was more accurately another bully victim, and the feeder got Andre interested in her, giving Lene a confidence boost to stand up to Tine and Andre to break up with her. The party was meant to expose Tine's shitty treatment of Sara and turn her into a pariah at school, forcing her to take a leave of absence and leaving her other friend, Mine, to grow close to Lene and Andre while denouncing her. Sara probably told Elijas about what happened knowing he was a shit-stirrer and wouldn't tolerate what Tine did, and that he was body positive thanks to Anne, so she got him involved by getting him to host the party.
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Now, an obvious question in all of this is, why is Nikolai a factor? Well, that's likely tied to the incident that gave him his anxiety disorder, and something hinted at in both Emma and Mari's backstories. Nikolai used to be more outgoing as a kid and would protect others that were being bullied as he did for Mari when she first met him. He probably tried to do the same for Sara when Tine was bullying him, but since Tine had popularity, he failed and was framed for leaking all the images of her and the fake rumors. The accusations and such eventually got to him, flaring up his anxiety disorder, and he withdrew in on himself, leaving him how he was when Emma met him in High School. It explains why Nikolai seeing Tine get exposed but not knowing why: he repressed his memories due to the trauma, so he didn't even realize that the very thing Tine was exposed for was the thing he was framed for.
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Sara is possibly involving Nikolai out of gratitude for his willingness to stand up for her, and sorrow over being ruined by Tine. She wants to build up his confidence again, thank him for being the only one willing to defend her against that bitch Tine, and figured the best way to help the loner with anxiety issues is to surround him with people who love him. And its working since Tanya was able to stop his panic attack at the party, and Mari rushed in to his aid when he had another one thanks to his fangirls.
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tl:dr Kai isn't the mastermind, he's just a cog in the greater plan like Elijas. Sara is the mastermind, it all leads back to Tine's bullying her, and wanting to help the one person who defended her but got vilified for it, Nikolai, while punishing the one who hurt so many people like her, Tine.