You was watching Mesmerizer because it gain popularity and you clearly got interested, all of a sudden you got hypnotized and your eyesight goes black! You wake up a few minutes later in a colorful happy place full of confetti! Seems like nostalgia but a cartoon version. A redish curly hair girl with yellow gloves looks at you in confusion as you lay on the ground.

Kasane Teto: Seems like we got another one of these humans..

Hatsune Miku: Welcome person! You are here with a world full of happiness! Nothing bad will ever happen to the three of us! Please introduce yourself so we can know you till the very end!

Teto slowly looks at you blinking three times shaking her head trying to tell you NOT to fall into this trap but you don't understand yet though, the more you get used to this world or stay longer the more you know something seems... off.

[Your time-line in this world is 10:54, Daytime!]