OUS(Okayama University of Science) team also detected clear superhumps of OT_J213806.6+261957. The light curve can be seen in the fllowing: http://blog-imgs-32-origin.fc2.com/t/n/b/tnblab/OT_J2138_20100516.png Kenji Tanabe (Okayama Univ.Sci)