Shibungi is the staff officer of the undertakers and is 27 years old.
Personality
He has a very calm and mature personalty and seems to enjoy teasing Gai. Saying "As expected of Gai", his favourite phrase, which is usually used as sarcasm.
Plot
He is seen silently behind Tsugumi as she locates the enemies that were around the area. Shibungi is seen totally amazed at the Power of Kings that Shu awakened before Gai orders Shu to meet him in fifteen seconds.
He is later seen telling Gai that the risk was too high and they shouldn't bother to rescue the hostages. However, Gai goes along with his plan to rescue them. He is seen again telling Gai he was sending Ayase to save him after they went to save Kido. Shibungi appears with Gai when Shu joins the Undertaker and congratulates him with everyone else when he becomes an official member. When Gai regroups with the team after a failed attempt at stealing the Leukocyte, Gai gets Shu upset, causing him to run outside. Shibungi asks Gai what they were supposed to do, but Gai says he'll carry on with the plan, which succeeds.