Mikuru gets fucked by Kyon
Haruhi knows about it by Yuki who is jealous and starts to show feelings
Haruhi becomes aware of her powers and a yandere, tries to kill Mikuru and Kyon, fails due to Itsuki who dies while protecting them
Mikuru wants to time travel to save herself and Kyon, but is stopped by Yuki who kills Mikuru, then she recognizes what she has done and kills herself
So Haruhi wants Kyon to love her but Kyon can't, Haruhi wants to kill Kyon but fails because Kyon is the true God
Kyon kills Haruhi, becomes some kind of ghostlike existance, creates a memorial place for Mikuru
Well because Haruhi damaged the universe heavily, Kyon has to sacrify himself to repair it
He seems to fail, everyone dies, well he just created a new, perfect universe with Kyonko.