The Ice Hoshira - SabiGiyuu

This is a SabiGiyuu story, aims to be as long as my other book (First Love - Sanegiyuu and Shinomitsu).
Will include slight uzuren, shinomitsu, and obasane, but not much.
Demon Slayer au, set around the Mt. Natagumo Ark.
No smutt bc I have asexual human syndrome, but there will be a little bit of kissing, and LOTS of angst.

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Unbeknownst to each other, both Sabito and Giyuu survived final selection. Where as Giyuu went un an upward trajectory toward Hoshira pretty much immediately, Sabito's rise was later.

Giyuu is now the water hoshira, but still saddened by the loss of his parents, his sister Tsutako, and his best friend Sabito. He is sent an a mission and comes back to everyone buzzing with excitement, but over what exactly?...

Sabito is in the process of making and refining his own breathing style, called Ice Breathing, when he accidentally runs into Lower Three. Will his new techniques prevail, or will he die before becoming a Hoshira?...