The title of this track (“Kura Kura”), translated from Japanese, actually reads something like “dizzy dizzy”. And Twice are making this statement in a romantic context. Or let’s say what actually has the vocalist “dizzy” is her love for the addressee.

And all of this of course is a fancy way of saying that she is thoroughly smitten. And all of that is yet another fancy way of saying that sentiment-wise the lyrics read like your standard love song, with an extra touch of emotional helplessness on behalf of the vocalist.

For instance the intro features the singer putting forth that she has “lost control of (her) heart and soul”. And she goes on to elaborate that this is caused by “unexplainable emotions” which populate her mind on a 24-hour basis.
And yes, said emotions may be unexplainable in the sense of her not knowing exactly where they came from. In other words, this would apparently be the first time she has fallen head over heels for someone in such a manner. But of course we already know exactly what emotion she is dealing.

And no, the word love is never actually mentioned in the lyrics. Instead, concerning the aforementioned “dizzy” analogy, the vocalist basically equates the way she is feeling to “sweet magic” and even more colorfully getting “absorbed into an entirety”.
You know, it’s like the task invariably at hand when dropping a spanking-new love song is to relay the same timeless sentiments in as fresh of a manner as possible.
So in this case, we have the featured vocalist being stricken by a related condition which she basically equates with an uncontrollable ‘dizziness’. And as to be expected she is likewise hoping that the addressee, i.e. the guy she has these feelings for, also feels the same about her. And by the looks of things such may already be the case, as they appear to share that type of rapport which is indicative of the early, euphoric stage of romance.