We cannot determine what happens after death on our own. We can reach a decision on such matters only if we base our lives on the teaching of Śākyamuni Buddha, the true teacher of all the people.

Nanjō Hyōe Shichirō-dono Gosho, A Letter to Lord Nanjō Hyōe Shichirō, Writings of Nichiren Shōnin, Doctrine 3, Pages 138.