This one seems to be sung more on the road than at home, though we did sing it at the last game I visited.
Japanese
Let’s Go 千葉マリーンズ
俺たちと共に
オー 千葉マリーンズ
熱い想い届け My Love
Romaji
Oh Chiba Marines
Oretachi to tomoni
Oh Chiba Marines
Atsui omoi todoke My Love
Video
Not mine, should replace it soon.