  L\'opez de Medrano, Rinc\'on and Shaw defined the Chern classes on tropical
manifolds as an extension of their theory of the Chern-Schwartz-MacPherson
cycles on matroids. This makes it possible to define the Riemann-Roch number of
tropical Cartier divisors on compact tropical manifolds. In this paper, we
introduce the notion of a moderate position, and discuss a conjecture that the
Riemann-Roch number $\operatorname{RR}(X;D)$ of a tropical submanifold $D$ of
codimension $1$ in moderate position on a compact tropical manifold $X$ is
equal to the topological Euler characteristic of the complement $X\setminus D$.
In particular, we prove it and its generalization when $\dim X=2$ and $X$
admits a Delzant face structure.
