Masami Shibaki is a minor character in Battle Royale II: Requiem. He was a member of the rugby team at Shikanotoride Middle School and had recently transferred from the Kansai region. Feeling isolated and lonely after the move, he was befriended by Takuma Aoi and his circle of friends, which helped him integrate into the class.

His personality is not extensively explored, but his willingness to follow Takuma into a dangerous situation suggests a sense of loyalty and a desire to belong. His primary motivation is tied to his friendship with Takuma; when Takuma decides to return to the island for the final confrontation against the government forces, Masami joins him along with classmate Osamu Kasai. This decision indicates a personal commitment to his friend and a willingness to risk his life.

Masami's role in the story is that of a supporting classmate who appears during the climactic battle. He is not a central figure and does not receive significant character development. He has no notable special abilities or combat skills highlighted in the film; his participation is driven by camaraderie rather than any unique talent. His key relationship is with Takuma Aoi, and he also appears to be on friendly terms with Osamu Kasai, though the depth of these bonds remains largely off-screen.

Overall, Masami Shibaki serves as a minor but loyal ally who acts on his friendship with Takuma during the final stages of the film.