Tooru Kazama is a member of the Kasukabe Defense Organization involved during events impacting the Nohara family. When Shinnosuke's parents start transforming into animals from a mysterious liquid, Kazama and the Organization attempt to help. During this assistance, Kazama and his comrades accidentally consume a partially prepared animalization drink themselves. This causes a partial transformation where they retain their human heads but gain animal bodies; Kazama specifically becomes a bat. Despite these physical changes, he keeps his human mind and works alongside his similarly altered teammates. They leverage their new animal abilities to tackle challenges and face the antagonists' henchmen. Kazama joins the group's mission to find Shinnosuke's captured parents and stop Mamoru Shizime's "Human Animalization Plan," contributing to the Kasukabe Defense Organization's efforts throughout the conflict.