Could That Be Seki-sensei's Sweetheart!?

Synopsis

Summer vacation ends and second semester begins. Seki-sensei arrives with a completely different hairstyle and outfit—something's clearly different about her. Everyone suspects she's found a sweetheart. Doremi and friends spot Seki-sensei with a man on the way home, deepening their conviction that she's getting married. They decide to investigate and find out what he's really like.