  We classify bions in the Grassmann $Gr_{N_{\rm F},N_{\rm C}}$ sigma model
(including the ${\mathbb C}P^{N_{\rm F}-1}$ model) on ${\mathbb R}^{1}\times
S^{1}$ with twisted boundary conditions. We formulate these models as $U(N_{\rm
C})$ gauge theories with $N_{\rm F}$ flavors in the fundamental
representations. These theories can be promoted to supersymmetric gauge
theories and further can be embedded into D-brane configurations in type II
superstring theories. We focus on specific configurations composed of multiple
fractional instantons, termed neutral bions and charged bions, which are
identified as perturbative infrared renormalons by \"{U}nsal and his
collaborators. We show that D-brane configurations as well as the moduli matrix
offer a very useful tool to classify all possible bion configurations in these
models. Contrary to the ${\mathbb C}P^{N_{\rm F}-1}$ model, there exist
Bogomol'nyi-Prasad-Sommerfield (BPS) fractional instantons with topological
charge greater than unity (of order $N_{\rm C}$) that cannot be reduced to a
composite of an instanton and fractional instantons. As a consequence, we find
that the Grassmann sigma model admits neutral bions made of BPS and anti-BPS
fractional instantons each of which has topological charge greater (less) than
one (minus one), that are not decomposable into instanton anti-instanton and
the rests. The ${\mathbb C}P^{N_{\rm F}-1}$ model is found to have no charged
bions. In contrast, we find that the Grassmann sigma model admits charged
bions, for which we construct exact non-BPS solutions of the field equations.
