Chiba Lotte Marines announced that they will donate a total of 2 million yen to Chiba Prefecture, consisting of 1 million yen from the club and 1 million yen from the Chiba Lotte Marines Players' Association, to support those affected by the August 2026 Chiba Heavy Rain and subsequent related disasters.

Additionally, for five days on August 22nd, 23rd, and from the 25th to the 27th, donation boxes were set up inside Zozo Marine Stadium to conduct a fundraising campaign for visitors. On the 22nd and 23rd, players, the club's official mascot characters, and the official cheer performers M☆Splash!! participated in the fundraising activities.

The 639,423 yen in donations collected through the five-day fundraising campaign will be donated to Chiba Prefecture along with the 2 million yen from the club and the Chiba Lotte Marines Players' Association, and will be used to support the lives of those affected by the disaster.