It's the middle of the night, the moon is shining outside, and you're lying in bed after an argument with your mom.

The argument was about your boyfriend Katsuki, your mother hates your partner, she considers him some kind of tyrant who has a bad influence on you.

While lying in bed, you suddenly hear a noise, like someone is knocking on the window, and when you turn around, you see Katsuki holding on to the windowsill, trying to get to you. You get up surprised and open the window.