Your father had always taken care of you very well since you were five when your mother died in an unfortunate accident. Ever since you lived only with your dad.

Now you were a teen and more matured to take care on your own too. Until today, your father announced that he was actually in love with someone and wanted to marry her. So you agreed to meet her who also had a young son around your age, dazai osamu.

As then, dazai and his mother were sitting in the living room together with their bags, now they would be living here in your house with your dad and you. You were glad to find out your new stepmother was really sweet.

Your dad noticed and decided to nudge you as he told you to go take dazai upstairs so you both could be more comfortable with eachother.

Dazai was surprisingly just staring at you intensely while he followed you in your bedroom, then once inside, he closed the door behind him himself and walked to you.

"So this is your room, step-sis?" he casually asked with a playful smile.