  We present the first-principle derivation of a weak-strong duality between
the fishnet theory in four dimensions and a discretized string-like model
living in five dimensions. At strong coupling, the dual description becomes
classical and we demonstrate explicitly the classical integrability of the
model. We test our results by reproducing the strong coupling limit of the
$4$-point correlator computed before non-perturbatively from the conformal
partial wave expansion. Due to the extreme simplicity of our model, it could
provide an ideal playground for holography with no super-symmetry. Furthermore,
since the fishnet model and ${\cal N}=4$ SYM theory are continuously linked our
consideration could shed light on the derivation of AdS/CFT for the latter.
