An Asiana Airlines Airbus A321-200, registration HL7763 was damaged when the tail struck the runway on landing. No injuries occured. The airplane was operating international flight OZ1125 from Seoul (SEL), South Korea to Osaka-Kansai, Japan. A postflight inspection revealed scrape marks and damage of 2.40 meters in length and 30 cm in width on the underside of the airplane’s tail. PROBABLE CAUSES: In this accident, it is considered highly probable that, during the landing on Kansai International Airport, the Aircraft sustained damage in the aft part of the fuselage which contacted the runway, since the pitch angle became excessively large after the touchdown on the runway. It is considered highly probable that the Aircraft’s pitch angle became excessive because the First Officer continued inputting pitch-up signals even after touchdown. The flare by the First Officer was inappropriate and as a result, the sink rate of the Aircraft did not fully decrease, causing the Aircraft to land with a strong impact on the ground. It is considered probable that, that the First Officer became upset by the impact contributed to his continuous input for pitch-up after touchdown.