なんようマンタであれば【
南洋マンタであれば
】

nan'yō mantadeareba

Noun

,

Da Copula

The "-eba" conditional form ("if/when…") of なんようマンタ

1. If it's a manta ray from the South Seas; If it were a South Seas manta ray

Ba Conditional

,

Usually Written in Kana