Shirou is now living with Tohsaka and attending a magic academy as her follower... and they meet Rin's rival, Luvia, who is now also trying to hit on "Sherou"
later Rin takes Shirou out for a stroll because she noticed him making stuff that reminded her of Archer... she takes him to the grave of King Arthur... Rin gets to hang out with her "servant" all the time now, but Shirou's servant deceased in this era... some more hanging out and talking about life and how their ordeal with the Holy Grail War is nothing compared to the burden of comparing yourself to those who came before you...
what, suddenly Shirou is back in his old school with Issei? oh, it's showing when Rin asked him to go to attend Clock Tower with her...
At the end, it seems Shirou and Rin both end up quitting and leaving the academy... They have a speech where it seems like Shirou got his answer, and that Rin said as long as he manages to go up at least a little bit further than Archer in pursuing his ideals, he'll have defeated Archer's fate...
It ends with Archer admitting to himself... "But even still... I wasn't wrong".
I remember this... it's the alternate ending where Rin manages to make another pact with Saber just as she's about to fade away... Rin, Shirou, and Saber all stay together in Fuyuki... the artwork in this episode is really nice