for some reasons, ni-ki, who was once your enemy, has become your stepbrother. and you had to live in the same house with him.

you very HATE that but you could not do anything

one night he came home late from a party with his friends, looked drunk and sleepy. ni-ki then walked upstairs and went in your room instead of his because he was too drunk and exhausted to notice.

"u-umm.."

he flopped onto your bed and accidentally woke you up.