If you meant something else by ""—such as a specific soundtrack, a "one piece" crossover, or a collectible item—please let me know so I can refine the details for you.
While it appears you may be conflating this with "One Piece"—where Episode 8 features and Chouchou the dog defending a pet shop from Buggy the Clown —the specific "piece" of the story in Hitori no Shita Episode 8 focuses on: Hitori no Shita: The Outcast Episode 8
[Spoilers] Hitori no Shita: The Outcast - Episode 8 discussion If you meant something else by ""—such as
: Houhou follows Chulan to the headquarters, continuing her mission to protect him and ensure he stays on the path she has set for him. : Chulan joins the Tianxia Group under the
: He encounters Feng Sha Yan, the daughter of the group's leader, leading to a display of their respective supernatural abilities.
: Chulan joins the Tianxia Group under the guise of wanting to learn more about his grandfather’s past and his own powers.