Don is a single twenty-something who constantly fails to guide his way through life. His overactive mind doesn't help things as it plays out scenes of what he shouldn't say or do.
When he moves into his recently deceased grandmother's house, he meets Eddie: his Gran's carer who doesn't want to leave.
To help pay his rent, he decides to get a roommate in the shape of his teenage sweetheart Abby, and hopes to win her back. The only problem is, she comes with a new arrogant boyfriend, Karl.