西武せいぶ池袋いけぶくろせんであれば
seibui kebuku rosendeareba

Noun
Da Copula

The "-eba" conditional form ("if/when…") of 西武池袋線

1. If it were the Seibu Ikebukuro Line; If the Seibu Ikebukuro Line were the case

Ba Conditional
Business