Context: Sonokawa Momoka 園川モモカ starts the series with wrong foot.
...n~~ atatteru... dake? ・・・ん~~当たってる・・・だけ? ...hmm~~ is [it] just... touching?
ataru 当たる To touch. To hit. For two things to be in contact with each other, like a girl's butt and a perv's hand.
iya, chigau na... kanppeki ni sawarareteru na kore wa... いや ちがうな・・・かんっぺきにさわられてるなコレは・・・ No, [that's not it]... [it] is completely [me] being touched, this [situation...