On the 5th, Seibu announced that they held a press conference after negotiations for the signing of pitcher Yuma Masaki (Sophia University), who is currently ranked 6th in the development team.

Masaki commented through the team, "I wasn't nervous until yesterday, but I was nervous at the moment I signed. Now that I've signed the provisional contract, I've realized that I need to pull myself together again. I'm in a lower position than my peers, so I want to do everything I can, absorb everything I can, and prepare for a contract with a contract manager. There's still a lot I don't know, but I'll do my best to contribute to the team as soon as possible."