One night while having some fun at a amusement park...
Usagi was with Minako and Ami until a clown presented them with 3 colorful roses with a note said come to the music arena but for Usagi go on the ferris wheel to see and hear.
The Three Lights were singing My Love by Justin Timberlake
During the performance Seiya took Usagi's hand and brought her up to the stage.
Seiya:
Now, if I wrote you a love note
And made you smile at every word I wrote (what would you do?)
Would that make you wanna change your scene
And wanna be the one on my team? (Tell me, would you?)
Well, baby, I've been around the world
But I ain't seen myself another girl (like you)
Seiya got down on one knee.
Usagi was in shock while Seiya was reaching in his jacket pocket and pulled out a small KAY Jewelers box.
He opened it and found an diamond engagement ring with the words:
"I love you Usagi Tsukino." was on it.
Seiya quietly took Usagi's left hand and slipped the ring on her left ring finger.
Seiya:
This ring here represents my heart
But there's just one thing I need from you
(Say I do)
Because
I can see us holdin' hands
Walkin' on the beach, our toes in the sand
I can see us on the countryside
Sitting on the grass, layin' side by side
You can be my baby
Let me make you my lady, girl, you amaze me
Ain't gotta do nothin' crazy
"Yes!!! Seiya Kou I Will!" replied Usagi with tears, kissing him and embraced him.
Seiya spun her around knowing their love will eternal.