The low-lying Scalar Mesons and Related Topics
  After presenting the motivations to explore the low-lying scalar mesons such as the $\sigma$, $a_0$ and $\kappa$ in the unquenched as well as quenched lattice QCD, we review the works done by our collaboration (SCALAR Collaboration) with a what-to-do-next list. We briefly mention the imporatance to explore the $N_c$ dependence of and possible effects of the $U_A(1)$ anomaly to the properties the low-lying scalar mesons. 
T. Kunihiro, S. Muroya, A. Nakamura, C. Nonaka, M. Sekiguchi and H.   Wada