first installment
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新商品の第一弾が来月発売される。
The first release of the new products will go on sale next month.
企画の第一弾として三本の動画を公開した。
As the first installment of the project, three videos were released.
第一弾の反応を見て次の内容を決める予定だ。
We plan to decide the next content after seeing the reaction to the first installment.