In this paper we first establish several integral identities involving the multiple polylogarithm functions and Kaneko-Tsumura A-function, which can be thought as a single-variable function of level two. We find that these integrals expressed in terms zeta (star) values, their related variants (multiple t-values, T-values, S-values, etc.), harmonic sums T-harmonic sums, S-harmonic are closely t...