(Proposal ID) S15B-085 (PI) Hirano, Teruyuki (Proposal Title) ESPRINT: A New Search for Transiting Planets Unveiled by K2 (Abstract) We propose to observe the systems with planet candidates unveiled by K2, the second mission of the {Kepler} spacecraft. One issue concerning the original {Kepler} mission was that due to the faintness of stars observed by {Kepler}, follow-up observations (e.g., mass measurements and atmospheric characterizations) for outstanding systems were often difficult. The new K2 mission has changed this situation since K2 observes 10-20 times more bright stars (V<13), for which we can measure RVs and conduct further characterizations. We developed our own tool to analyze the K2 data, having detected dozens of planet candidates in fields 0 and 1. Our proposed observation here involves validations of planet candidates for the seven most interesting targets in fields 0 and 1 using the combination of reconnaissance spectroscopy and high-contrast imaging which allow us to statistically rule out the false positives. Our targets for planet validation include small planets (super-Earth and Neptune-sized) around the habitable zone of the central M stars, and ultra-short period planets, both of which are outstanding targets for future follow-up studies. We also plan to measure RVs for a few especially unique systems, one of which has the smallest planet among those that Subaru has ever discovered.