If you're looking for manga similar to Gichi Gichi-kun, you might like these titles.
A Japanese goddess of old takes a keen interest in Anamori Izumi and her ability, a more powerful form of synesthesia. The goddess has a request for her, one which will require her to break out of her shell... and learn how to play the electric guitar.
A highschool detective special interest group meets up with all sorts of murders and mysteries, including supernaturals. Included is a dog with an attitude.