While practicing penalty kicks, Sanada's soccer ball accidentally hits Kou while he's riding his bike past the park, injuring Kou's ankle. Kou is upset and makes Sanada promise to play his next match and score a goal using his right leg.

The missing teacher, Masahiro Tanba, is found in the toilet, apparently drowned. Makoto Kyogoku becomes the prime suspect as the culprit is likely to have carried the victim to the toilet after drowning him.