Song is usually called "ClariS - Connect (Nightcore Trance Remix)" 
But in actuality this nightcore remix is by EXIT TUNES, from their album "EXIT TRANCE PRESENTS SPEED ANIME TRANCE BEST THE FINAL"
Catalog Number	QWCE-00412
https://www.youtube.com/watch?v=aWkcmyc5r9c

EXIT TRANCE PRESENTS SPEED ANIME TRANCE BEST THE FINAL

Connect (Nightcore Ver.)

EXIT TUNES - Connect (Nightcore Ver.)

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EXIT TUNES - Connect (Nightcore Ver.)

rrr.,(=)