It pretty much stays as a fluffy comedy for all 5 volumes, though the volume with the most drama is #4, which is Karen's volume(the volumes tend to focus on a different girl by giving their backstory along with having an issue involving Saigi, though Maka is ever-present in all of them).
For the record, here's how the volumes shake out: 1/Maka, 2/Nui, 3/Muku, 4/Karen, and 5/Miharu(somewhat)