This is the relationship between Mr. Kasugano and Mrs. Kasugano, Haruka and Sora's departed parents.
Yosuga-no-Sora Review 06

Mr. Kasugano with Mrs. Kasugano and Haruka and Sora.


Before their untimely death in a car accident, it seems through various family photo albums and flashbacks that they were in a very happy marriage. Both cared for their children deeply.


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