It's been 10 years after the events of Summer, and Phineas must decide what University to go to. After discovering that Isabella had a crush on him for years, Phineas must reach her before she leaves for college and express his true feelings for her. Meanwhile, Doofenshmirtz has a mid-life crisis.
But for so long, you were blind.
Now it's time to face tomorrow,
And leave all that stuff behind.
Of what would our lives have been like,
If you'd just given me a sign.
'Cause I like you more than every other,
Teen Phineas talking with Vivian.
I can't believe that all this time, you never said a word.
Although it's possible you did,
But I must say that, in retrospect, you were being quite
And now our endless summer,
Is finally coming to an end.
I tried to make the most of every day,
But now the years just seem misspent...
We might've been an item...
They would've called us...
I would've held the door for you,
I would've shared my umbrella.
You could've held my hair back,
(Sick with salmonella...)
We could've been together, all you had to say was when.
And though I wanted so much more,
I guess you'll always be my friend...
Isabella staring at Phineas.
Phineas is wondering if he can sit right next to her.
Phineas and Isabella are about to hug.
Isabella noticing that she's holding Phineas' hands.
"Hmmm...as a matter of fact..."
Isabella feeling very happy.
Isabella thinks about Phineas.
Isabella and Phineas smile each other.