Kenichi: The Mightiest Disciple S01 E50 The Mightiest Disciple, Kenichi!

"From Wimp To Warrior. Sort of."

Cornered by Kenichi's unexpected reaction, Ryuto utilizes a dangerous technique to rise up his power beyond his body's limits, and the reason for his grudge on him is revealed. As their fight comes close to a conclusion, Kenichi continues determined to win, not only for his own sake, but for his childhood friend's too.