Empty Condenses

Giyu was very young when his parents died. He only remembered the pats on his back and empty concedes of his 'Very fine parents. Good people indeed.' Since then, it was only him and Tsutako, his older sister.

Since then, his curiosity never truly faded, an itch that nibbled at his consciousness.

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Giyu Tomioka is Muzan Kibutsiji's son. That's all you need to know.

Warning:
Manga and/or anime spoilers
Ships include:
Obamisu
Tankanao
Zennezu
In short, every ship that actually happens in the manga.