Ninja villages were destroyed, the dead were resurrected, a touch of blood took away everything, but also brought something, and a blood-drinking empire rose. But when the ninjas were tired of dealing with this powerful enemy, a mysterious power from the East quietly arrived.
As for Jiraiya, he was also a member of the resuscitators, but by mistake, he became the bridge connecting ninjutsu and senjutsu. The wandering dragon who had been wandering for half his life was reborn from nirvana and became a wanderer again to compose an epic poem.