  We consider a scenario where light bino is the next-to-lightest
supersymmetric particle (NLSP) and gravitino/axino is the lightest
superysmmetric particle (LSP). For a bino mass less than or around hundred GeV,
it can be pair produced at the future lepton colliders through $t-$channel
slepton exchange, subsequently decaying into a gravitino/axino plus a photon.
We study the prospects to look for such binos at the future colliders and find
that a bino mass around 100 GeV can be probed at the $2\sigma$ ($5\sigma$)
level for a slepton below 2 TeV (1.5 TeV) with a luminosity 3 $ab^{-1}$. For a
bino mass around 10 GeV, a slepton mass less than 4 TeV (3 TeV) can be probed
at the $2\sigma$ ($5\sigma$) level, which is much beyond the reach of the LHC
for direct slepton searches.
