Seibu Lions announced that Mitsuki Ono, a Saitama native who won a bronze medal in the women's halfpipe snowboarding event at the Milan-Cortina Olympics, will throw the opening pitch as a guest at the home opening game on March 31st.

Ono commented through the team, "Hello, The Lions fans. I'm Ono Mitsuki. I'm very happy to have been invited to pitch on this special day, the home opening game of Saitama Seibu Lions a team from my hometown of Saitama! This is my first time throwing the first pitch, so I'm a little nervous, but I'll do my best to be myself and throw with all my might, and enjoy it to the fullest!"

Also, at the home opening ceremony on the same day, pianist Shinya Kiyozuka will perform a song he composed for The Lions, "WE ARE ONE," and the national anthem, "Kimigayo." "WE ARE ONE" has been used as the song when players run out onto ground since the 2021 season.