それは初耳だ。
それは初耳だよ。
That is the first time for me to hear that.
初耳ですね。
This is the first time I heard about it.
This is a beginning.
This is the beginning.
That is not the first time that I heard that.
I expect this is your first time for this.
I am glad to meet you―pleased to know you―delighted to make your acquaintance―(通例は)―How do you do?
the state of something that is being experienced for the first time
私にとってそれは初耳だった