A person's power is not decided by his physical strength, there's a much more important thing within.

Yankumi has convinced Ryu to go back to school but Hayato is still against him. The atmosphere in class suddenly changed when the two met. Although Ryu isn't against the reconciliation thing, Hayato still holds grudge of what Ryu did in the past. While Yankumi tries her best to let the two make up, Hayato took Yankumi as an annyoing teacher leading him to challenge her.