ような without a noun following it > **** Why is used before the comma? I think it means: > Since who knows when, if Hisui comes, as if i am brought with a tranquil morning, that way the day starts. But I do not understand why is used before the comma.

There certainly is a noun following , if the noun does not **_directly_** follow it. That noun is []{}.

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is an adjectival phrase that modifies .

also modifies .

here means "that sort of". The author could have just said **** without using .

, however, is such a **_long and eloquent_** adjectival phrase that it could sound a little "affected" if the author placed directly following it.

By placing (= "that sort of"), it could serve as a softener that brings the eloquence level down a bit.

My shot at a TL:

"Since who knows when, a sort of a daily routine has been formed in which I feel as if I could greet the dawn peacefully whenever Hisui comes/is here."