Kenichi: The Mightiest Disciple S01 E14 Dedicated Training! And a Nearby Hot Spring Bath!

"From Wimp To Warrior. Sort of."

After his defeat with Shinosuke Tsuji, the masters decided to have Kenichi live with them. This would include 24 hour hell-like training. Kenichi accepts with the idea that he would be living with Miu under the same roof. Kensei later drags Kenichi do a "special training" with him by tryring to peek on Miu and Shigure's bath unnoticed.