At this time, someone on board a vehicle for the Mainichi Newspapers played "Kimigayo" (Japan's national anthem), and some students who were offended by it started to sing an antiwar song "Heiwa wo mamore" (maintain peace) and many students joined forces with them.
この時、正門外で突然毎日新聞社の車が「君が代」を流したため、これに反発した学生の中から反戦歌「平和を守れ」の歌声が流れ、次第に大合唱となった。