Naota's life is confined to going to school and living with his father and grandfather. The usually boring life in Mabase is rudely interrupted by the arrival of Haruko Haruhara, who bursts on the scene by running Naota over with her Vespa scooter and hitting him on the head with a blue vintage Rickenbacker 4001 left-handed electric bass guitar. Later, Naota is shocked to find Haruko working in his house as a live-in maid.