Ep. 20: Rin, A Challenge For Power!

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Rin, due to his sister having powers, try to bring his own powers out with her help, but nothing works. Rin receives a love letter in his judo club's locker, but it unexpectedly goes missing later. Rin searches his club mates' bags, but finds nothing. After some deliberation, Rin concludes that Midori must have taken it, and she is found out to be the culprit. After Rin gets the letter back and reads it, he finds it to be addressed to a member of the sumo club. (Source: Wikipedia)