On the 5th, Lotte announced that manager Masahito Yoshii had offered to resign by the 4th and that the offer had been accepted. A successor will be announced once it has been decided.

Manager Yoshii took over from Manager Iguchi Toshihito in 2011. In his first year in 2011, he led the team to a second-place finish with 70 wins, 68 losses, and 5 ties, and to their first appearance in the Climax Series in two years. Last season, he also led the team to a third-place finish with 71 wins, 66 losses, and 6 ties, and to their second consecutive appearance in the CS.

However, in his third year in charge this season, the team opened with three consecutive wins against last season's league champions, Softbank, but has since been unable to increase its winning streak, and after 142 games, the team is in last place with 56 wins, 83 losses and 3 ties.