After the fall of Babuu, the gang takes Heppokomaru to the hospital to recover. After hearing how his little sister was abducted by the Neo Maruhage Empire, Bo-bobo decides to rescue her from the Nagoya Brothers, who currently reside in the city of Nagoya. During this saga, the team meets up with Tokoro Tennosuke again, they also gain a new partner, but lose one later...