What was turning out to be a simple day was interrupted by Isuka-San, a time traveler who needs to borrow Nyarko’s body.  But in her rush, not everything goes as planned.
but I accidentally swapped 
your bodies instead.
pero en lugar de eso accidentalmente 
cambié sus cuerpos.
pero sin querer, me equivoqué y os intercambié los cuerpos.
Mas acidentalmente troquei vocês de corpos.