On July 20th, at Zozo Marine Stadium, at the Chiba Lotte Marines vs. Fukuoka Softbank game, Lotte Co., Ltd.'s sponsored game "Cold and Blue, Summer Has Come. Coolish & Sou DAY" was held. A special first baseman pitch ceremony was held featuring popular VTubers Suisei Hoshimachi and Hatsune Miku, who appear in Lotte's "Coolish" and "Sou" TV commercials.

During the ceremony, Suisei Hoshimachi and Miku Hoshimachi appeared on the stadium's main vision. A special performance linking the stadium's main vision and mound was held, and while Miku Hatsune cheered them on, Suisei Hoshimachi stepped up to the mound. first baseman Before the pitch, Suisei Hoshimachi commented, "I'll do my best aiming for a blazing fastball!!" and her performance was brilliantly "strike pitch." The speed gun at the stadium displayed 105 km/h.