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は初めてだ

it's the first time

→ は
phrase Uncommon #11,065
it's the first time Used to say that something is being experienced for the first time. It commonly follows a noun or a verb phrase ending in の, as in 映画を見るのは初めてだ, “it's my first time watching a movie.”
JA: 日本で電車に乗るのは初めてだ。
EN: It's my first time riding a train in Japan.

でも君のようなエブリンは初めてだ

But an Evelyn like you is a first for me.

— エブリシング・エブリウェア・オール・アット・ワンス (2022)

こんな怖い小説は初めてだ。

I've never read a novel this frightening before.

今日のような恐ろしい話は初めてだ

I've never heard such a terrifying story before.

— 羅生門 (1950)

あんな強情な人は初めてだよ。

I've never met anyone so stubborn.

こんなに恐い映画は初めてだ。

I've never seen a movie this scary before.

母とは初めてだね

This is the first time you've met my mother, isn't it?

— マルホランド・ドライブ (2001)