  The two kaon factories, KOTO and NA62, are at the cutting edge of the
intensity frontier, with an unprecedented numbers of long lived and charged
Kaons, ~ 10^{13}, being measured and analyzed. These experiments have currently
a unique opportunity to search for dark sectors. In this paper, we demonstrate
that searches done at KOTO and NA62 are complementary, both probing uncharted
territories. We consider two qualitatively different physics cases. In the
first, we analyze models of axion-like-particles (ALP) which couple to gluons
or electroweak gauge bosons. In the second, we introduce a model based on an
approximate strange flavor symmetry that leads to a strong violation of the
Grossman-Nir bound. For the first scenario, we design a new search strategy for
the KOTO experiment, K_L -> pi^0 a -> 4 gamma . Its expected sensitivity on the
branching ratio is at the level of 10^{-9}. This demonstrates the great
potential of KOTO as a discovery machine. In addition, we revisit other bounds
on ALPs from Kaon factories, highlighting the main sources of theoretical
uncertainty, and collider experiments, and show new projections. For the second
scenario, we show that the model may be compatible with the preliminary
analysis of the KOTO-data that shows a hint for New Physics.
