  We theoretically demonstrate the realization of a chiral edge mode in a
system beyond natural science. Specifically, we elucidate that a kagome network
of rock-paper-scissors (K-RPS) hosts a chiral edge mode of the population
density which is protected by the non-trivial topology in the bulk. The
emergence of the chiral edge mode is demonstrated by numerically solving the
Lotka-Volterra (LV) equation. This numerical result can be intuitively
understood in terms of cyclic motion of a single RPS cycle which is analogues
to the cyclotron motion of fermions. Furthermore, we point out that a
linearized LV equation is mathematically equivalent to the Schr\"odinger
equation describing quantum systems. This equivalence allows us to clarify the
topological origin of the chiral edge mode in the K-RPS; a non-zero Chern
number of the payoff matrix induces the chiral edge mode of the population
density, which exemplifies the bulk-edge correspondence in two-dimensional
systems described by evolutionary game theory.
