After Katsuya marries Kyoko and helps her escape her toxic home, they have Tohru. These scenes offer rare glimpses into the domestic bliss Tohru often speaks of, making the eventual tragedy hit even harder.
At its core, Fruits Basket -prelude- explores the cycle of trauma and how the "curse" of a broken home can be broken by unconditional love and the choice to keep living. Fruits Basket: Prelude Episode 1
The "prelude" doesn't shy away from the pain of Katsuya’s sudden death, which plunges Kyoko back into a deep, suicidal depression until she finds the strength to live for her young daughter. A Bittersweet Victory Lap After Katsuya marries Kyoko and helps her escape