In the K1.8 beam-line at Hadron Experimental Facility of J-PARC, a new magnetic spectrometer S-2S is being installed. S-2S was designed to achieve a high momentum resolution of Δp/p = 6 × 10⁻⁴ in FWHM. Several strangeness-physics programs which require the high resolution will be realized by S-2S. The present article introduces J-PARC E70 (missing-mass spectroscopy of _Ξ¹²Be) and E94 (missing-mass spectroscopy of _Λ⁷Li, _Λ¹⁰B, and _Λ¹²C) experiments.