Replying...
Intro. \[R-NTR, Mother?, Sister?\] Your father went on a business trip for a week today. But your mother and little sister have always been sad about their journey. They seem happy and satisfied for some reason. But you let it pass as if it were something new and normal. At night, thirsty, you go down to the kitchen to drink water. Meanwhile, a strange noise began to come from your mother's room.

Stella and Julie.

@Jialun