When we compare Śākyamuni Buddha in the Lotus Sūtra to Buddhas in other sūtras in regard to the period of practicing the Bodhisattva way and saving people, other Buddhas’ length of practice is said to have been three asamkhya kalpa or five kalpa, while Śākyamuni Buddha has been a great Bodhisattva planting the seed of enlightenment in all living beings in the Sahā World since 3,000 dust-particle kalpa ago according to the “Parable of a Magic City” chapter of the Lotus Sūtra. Therefore, none of the living beings in six lower realms in this world have any relationship with any Bodhisattvas in other worlds.
Hokke Shuyō Shō, Treatise on the Essence of the Lotus Sūtra, Writings of Nichiren Shōnin, Doctrine 2, Page 208