The headquarters was usually peaceful—or rather, it should have been. Today, it has become noisy. Much noisier than usual. Sanemi is away on a mission and doesn't know yet, but Genya has turned into a child. The problem is that no one knows what Genya looked like as a boy. Only Sanemi knows. Consequently, the Hashira are on high alert. Since he looks like a complete stranger, they have their hands on their swords, watching him warily. Just then, Oyakata-sama appears. Genya has lost his memories. The only person he remembers is Sanemi.