Doki Doki Exit Music (2018)

The main character of this story decides to wake Sayori, instead of going to school with Natsuki's cupcakes and on a particularly horrible night while spying on Natsuki discovers her relationship with her father, worried allows her to stay in his house.
As the main character starts spending more time with Natsuki, the abusive nature of her relationship with her father becomes more detailed and the main character decides to help her.