Seibu Lions has announced that it will hold a denim fashion-themed "Dress Up Series" for a total of six games, including games Rakuten Eagles from May 8th to 10th and games against Orix Buffaloes from May 22nd to 24th.

This event is a collaborative project with the Japan Jeans Council, which organizes the "Best Jeanist" awards. The highlight of the event is the fan vote, which will begin on the 2nd, to select The Lions' "Best Jeanist" from among 13 players dressed in blue denim. Voting will be available through The Lions official LINE account and at a polling station set up at Belluna Dome during the event, with the results announced before the game on the 24th. There will also be an order sale for limited edition "Dress Up Series" merchandise featuring newly taken photos of the players.

Additionally, Okamiya Raimu will appear on the ceremonial pitch on the 10th, and the five-member boy band WILD BLUE will appear on the 24th.