The quints all go to the same class is already foreshadowed by Negi long ago. Remember the scene where someone said "The bride used to be a classmate of his"? At that point, the only classmate of Fuutarou is only Itsuki. To make it fair and spice things up, I know that they would somehow go to the same class to emphasize that war is still open to all girls!
Yeah, I am excited to see some events happened in school rather than them only studying at home.
It would be interesting also to see how the friends perceived the quints. I mean they are sisters, beautiful, and *ehem*. They should be frickin popular. It raises me a big question why Fuutarou is the only male counterpart of their interaction.
except for Ichika who already been confessed to by some guy I forgot