An x Empty x Threat!

Name: An x Empty x Threat!
Director: Kim Min-sun
Released: 2012-05-27
Duration: 24 min
Rating: 7.5
Cast: Tomoya Kawai, Toshihiko Seki, Yuka Terasaki, Toru Nara, Kazuma Takeo

S1 E33 May 27, 2012 0h 24m ★ 7.5

Source:

Overview

After two months, Gon and Killua are finally allowed to practice Nen again. That's when Gido, Sadaso, and Riehlvelt appear before them and tell them to fight them in the arena. Gon and Killua refuse, but Killua finds Sadaso's behavior to be very suspicious.