S401：Elena remembered the memory compelled to forget by Demon about first
meeting and love's confession between themselves.
　　　Council's blew up.
S402：vampire hunter " Connor " coming / Elena drunk Damon's blood
Stefan found Elena's adjustment problem
S403：Matt be a blood bag / Klaus、Demon met Connor in hospital.
Klaus found " one of the five "
Demon decided to teach Elena feeding blood
S404：Elena's feeding in college with Demon / Bonnie and professor Shane
　　　Klaus、Stef、Rebekah talking " the five " story and cure
Rebekah's daggered by Stef、Klaus
S405：Connor caught Jeremy、Matt、April in the bar
Elena killed Connor / Damon knew the cure
S406：Elena's hallucination to kill herself / ES's brekup
S407：Stefan compelled Jeremy to kill vampire / Jeremy hurt Elena
　　　DE's making out
Caroline told Stefan all is because she's sired to Demon.
S408：Damon's sure that Elena's sired to him indeed.
Charlotte crashed Damon since 1942.
　　　Demon、Stefen went to New Orleans for breaking sire bond.
　　　Stefan and Elena finally knowing what the sire is respectively.
　　　Another werewolf, Kim, caught Caroline to intimidateTyler for alpha
Elena's sacrifice saved Caroline.
　　　Demon wanted to let Elena go and Elena refused, telling him not to deny
their feeling.
　　　12 human sacrifice = expression which is worse than black magic
S409：Elena and Damon're in lake house / Stefan know DE've slept
　　　Silas' story / prefessor and Hayley's plan
Klaus killed 12 werewolfs and Tyler's mom / Rebekah revived by April
S410：Elena, Stefan, Caroline and Tyler were caught by Rebekah
　　　Shane's almost killed by Rebekah and Kol.
　　　Damon, Jeremy and Matt hunted vampires turned by Klaus.