Kasahara made his Ichi-gun debut on May 24 against Lotte at YafuOku Dome. His father Eichi and his brother Shoki also played professionally. They became the second family of three (father and two sons/brothers) in NPB history to play in at least one game in the NPB. The other family: Donoue included one pitcher (father Terashi) and two position players (sons Takehiro and Naomichi).
Source: Nikkan Sports 5/25/2017