Yasuo Hayashi and Shigeo Sugimoto were the team assigned to drop sarin on the southwest-bound Hibiya Line departing Kita-Senju Station for Naka-Meguro Station. Unlike the rest of the attackers, Hayashi carried three sarin packets onto the train instead of two. Prior to the attack, Hayashi asked to carry a flawed leftover packet in addition to the two others in an apparent bid to allay suspicions and prove his loyalty to the group.
