The above quote is from Celina/Serena from Yu-Gi-Oh! ARC-V
Serena unlock event starts from July 26 to August 7.
Play the Event to get as drops;
UR: Lunalight Blue Cat
SR: Lunalight Serenade Dance

Comment from her Japanese Voice Actor, 稲村優奈 (Yuna Inamura);

“I was able to participate as Serena this time in Yu-Gi-Oh! Duel Links as Serena. She has a different charm compared to Yuzu. I dueled really hard with the sweat of my brow! I hope everyone also finds their time with Serena fun.”