The episode included with the 13th volume is about the first Sumo competition conducted in Tempest, as recommended by Rimuru. The three-part OVA included with the fourteenth, fifteenth, and sixteenth manga volumes is an original trilogy created by Fuse. Rimuru has been instructing Shizue's students in the Freedom Academy of Ingracia Kingdom. It's time for the school's annual outdoor training session, where students will put their fighting abilities to the test in the outdoors. Rimuru is motivated to win the tournament and collect the prize money, but he is opposed by Jeff, an honorary instructor who sees Rimuru as a competitor. The competition is in full swing until an unexpected foe enters!