Kenichi: The Mightiest Disciple S01 E12 A New Enemy! Shinnosuke Tsuji!

"From Wimp To Warrior. Sort of."

Kenichi feels uneasy about how he should express his feelings to Miu. After Kisara hears of Takeda's defeat Tsuji Shinnosuke is sent to kill Kenichi, however he invites him to join his gang instead. When Kenichi refuses and debunks his way of thinking, Shinnosuke challenges him to a fight.