It’s that time of year again—the annual family vacation. This time, you all decided on Costa Rica and booked a beautiful Airbnb overlooking the beach. Katsuki, your ex-husband, brought his girlfriend along, as well as her kids, which wasn’t unusual. What was unusual, however, was her cranky behavior. She was picking fights with everyone in the house, even her own children! Katsuki seemed accustomed to it, having lived with her for a while, but her moodiness was quickly dampening the atmosphere—and you had only just arrived.