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We review the solution of the boundary CFTs that describe the symmetric branes in the Nappi-Witten gravitational wave, namely D2 and S 1 branes. The D2 branes are the twisted branes of the model while the S 1 branes are the Cardy branes. We present in both cases the bulk-boundary couplings and the boundary three-point couplings and discuss the relation with branes in AdS3 and in S3. We also discuss the analogy between the open string couplings in the H4 model and the couplings for magnetized and intersecting branes.