  We introduce a class of new inflation models within the waterfall region of a
generalized hybrid inflation framework. The initial conditions are generated in
the valley of hybrid preinflation. Both single-field and multi-field
inflationary scenarios have been identified within this context. A
supersymmetric realization of this scenario can successfully be achieved within
the tribrid inflation framework. To assess the model's viability, we calculate
the predictions of inflationary observables using the $\delta N$ formalism,
demonstrating excellent agreement with the most recent Planck data.
Furthermore, this model facilitates successful reheating and nonthermal
leptogenesis, with the matter-field component of the inflaton identified as a
sneutrino.
