Saitama Prefecture is home to the baseball club Seibu Lions and the popular anime/manga franchise Lucky☆Star (らき☆すた). To honor the anime series, Seibu Lions have dedicated 24 Jun as “Lucky☆Star Day” and have invited seiyuu Fukuhara Kaori (福原 香織), the voice behind Hiiragi Tsukasa, to throw the opening first pitch during the game against Orix Buffalo.
Source: 声優速報
