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In this paper, we consider the physics performance of a single far detectorcomposed of a 100 kton next generation Liquid Argon Time Projection Chamber(LAr TPC) possibly located at shallow depth, coupled to the J-PARC neutrinobeam facility with a realistic 1.66 MW operation of the Main Ring. The new fardetector could be located in the region of Okinoshima islands (baseline $L\sim658$ km). Our emphasis is based on the measurement of the $\theta_{13}$ and$\delta_{CP}$ parameters, possibly following indications for a non-vanishing$\theta_{13}$ in T2K, and relies on the opportunity offered by the LAr TPC toreconstruct the incoming neutrino energy with high precision compared to otherlarge detector technologies. We mention other possible baselines like forexample J-PARC-Kamioka (baseline $L\sim 295$ km), or J-PARC-Eastern Koreancoast (baseline $L\sim 1025$ km). Such a detector would also further explorethe existence of proton decays.

A Possible Future Long Baseline Neutrino and Nucleon Decay Experiment  with a 100 kton Liquid Argon TPC at Okinoshima using the J-PARC Neutrino  Facility