  This is a continuation of the paper "Four-dimensional Painlev\'e-type
equations associated with ramified linear equations I: Matrix Painlev\'e
systems" (arXiv:1608.03927). In this series of three papers we aim to construct
the complete degeneration scheme of four-dimensional Painlev\'e-type equations.
In the present paper, we construct the degeneration scheme of what we call the
Sasano system.
