Seibu Lions' rookie joint voluntary training ended on the 28th. On the final day, they held a batting practice session at Belluna Dome, where first-round draft catcher Taiga Kojima (Meiji University) hit a series of home runs from the left batter's box, with manager Nishiguchi and first-team chief and batting coach Hitoshi watching. "I batted while focusing on making a good swing. It's a great stadium, so I feel like I want to play here," he said with a raised voice.

He completed his voluntary training without injury and expressed satisfaction, saying, "I'm in good condition for camp." He is expected to be an immediate hitter catcher and will start at the first-team Nango camp. "My strength is batting, so I hope you'll come and see my batting," he said, intending to actively promote himself.